Tower not getting power?

garaboldi

70-290
Member
Im working on Compaq something tower. Doing a favor for the mother in law. This tower is her co-workers and asked if I could look at it.

At first glance, all the internal cables and wired are firmly attached. So I direct my attention to the power source, It is equipped with a green led light (to tell its getting power I assume). This little green light is not lighting up when plugged in. Its doing nothing. Power source model is a Bestec ATX-250-12z

Any ideas or suggestions?
 

My Computer

System One

  • Manufacturer/Model
    Dell Latitude D530
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    Intell Core Duo T7250 @2.00 GHz
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    Not sure-Dont see it under Device Manager
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    4.0 GHZ
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    Mobile Intel(R) 965 Express Chipset Family
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    SigmaTel High Def
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    Intel Mobile 965 Express chipset Family
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    Standard PS/2 Keyboard
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    64-130 Mpbs
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    Also Running: Server 2k3 and Vista Business in VPC.

Dwarf

The Contemplator
Vista Guru
Gold Member
Hi garaboldi,

This might sound daft, but I've done it before. Have you made sure that you have plugged it in and switched on at the wall socket? Is there power to the wall socket? Try with another appliance that you know is working. Does the fuse need changing in the plug, and is the wiring secure?
 

My Computer

System One

  • Manufacturer/Model
    Dwarf Dwf/11/2012 r09/2013
    CPU
    Intel Core-i5-3570K 4-core @ 3.4GHz (Ivy Bridge) (OC 4.2GHz)
    Motherboard
    ASRock Z77 Extreme4-M
    Memory
    4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB)
    Graphics Card(s)
    MSI GeForce GTX770 Gaming OC 2GB
    Sound Card
    Realtek High Definition on board solution (ALC 898)
    Monitor(s) Displays
    ViewSonic VA1912w Widescreen
    Screen Resolution
    1440x900
    Hard Drives
    OCZ Agility 3 120GB SATA III x2 (RAID 0)
    Samsung HD501LJ 500GB SATA II x2
    Hitachi HDS721010CLA332 1TB SATA II
    Iomega 1.5TB Ext USB 2.0
    WD 2.0TB Ext USB 3.0
    PSU
    XFX Pro Series 850W Semi-Modular
    Case
    Gigabyte IF233
    Cooling
    1 x 120mm Front Inlet 1 x 120mm Rear Exhaust
    Mouse
    Microsoft Comfort Mouse 3000 for Business (USB)
    Keyboard
    Microsoft Comfort Curve Keyboard 3000 (USB)
    Internet Speed
    NetGear DG834Gv3 ADSL Modem/Router (Ethernet) ~4.0 Mb/s (O2)
    Other Info
    Optical Drive: HL-DT-ST BD-RE BH10LS30 SATA Bluray
    Lexmark S305 Printer/Scanner/Copier (USB)
    WEI Score: 8.1/8.1/8.5/8.5/8.25
    Asus Eee PC 1011PX Netbook (Windows 7 x86 Starter)

garaboldi

70-290
Member
Hi garaboldi,

This might sound daft, but I've done it before. Have you made sure that you have plugged it in and switched on at the wall socket? Is there power to the wall socket? Try with another appliance that you know is working. Does the fuse need changing in the plug, and is the wiring secure?

Dwarf, Any suggestions will be welcomed. Wall socket does have power, and the computer is plugged in. I don't see a fuse connected to the power cord. The wiring harnesses were all secure and snug when I removed the power supply from the tower.

Keep the suggestions coming people. I will update my progress.
 

My Computer

System One

  • Manufacturer/Model
    Dell Latitude D530
    CPU
    Intell Core Duo T7250 @2.00 GHz
    Motherboard
    Not sure-Dont see it under Device Manager
    Memory
    4.0 GHZ
    Graphics Card(s)
    Mobile Intel(R) 965 Express Chipset Family
    Sound Card
    SigmaTel High Def
    Monitor(s) Displays
    Intel Mobile 965 Express chipset Family
    Screen Resolution
    1024x768
    Mouse
    Logitech Wireless
    Keyboard
    Standard PS/2 Keyboard
    Internet Speed
    64-130 Mpbs
    Other Info
    Also Running: Server 2k3 and Vista Business in VPC.

Brink

Staff member
mvp
I had forgot to turn the switch on at the back of the PSU once. :o

Have you checked that as well?
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD

Dwarf

The Contemplator
Vista Guru
Gold Member
Does the PSU have a standard ATX style main power connector?
Capture.PNG
If so, connect a multimeter to pins 7 and 9. Are you getting a reading of between 4.9 and 5.1 volts?
 

My Computer

System One

  • Manufacturer/Model
    Dwarf Dwf/11/2012 r09/2013
    CPU
    Intel Core-i5-3570K 4-core @ 3.4GHz (Ivy Bridge) (OC 4.2GHz)
    Motherboard
    ASRock Z77 Extreme4-M
    Memory
    4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB)
    Graphics Card(s)
    MSI GeForce GTX770 Gaming OC 2GB
    Sound Card
    Realtek High Definition on board solution (ALC 898)
    Monitor(s) Displays
    ViewSonic VA1912w Widescreen
    Screen Resolution
    1440x900
    Hard Drives
    OCZ Agility 3 120GB SATA III x2 (RAID 0)
    Samsung HD501LJ 500GB SATA II x2
    Hitachi HDS721010CLA332 1TB SATA II
    Iomega 1.5TB Ext USB 2.0
    WD 2.0TB Ext USB 3.0
    PSU
    XFX Pro Series 850W Semi-Modular
    Case
    Gigabyte IF233
    Cooling
    1 x 120mm Front Inlet 1 x 120mm Rear Exhaust
    Mouse
    Microsoft Comfort Mouse 3000 for Business (USB)
    Keyboard
    Microsoft Comfort Curve Keyboard 3000 (USB)
    Internet Speed
    NetGear DG834Gv3 ADSL Modem/Router (Ethernet) ~4.0 Mb/s (O2)
    Other Info
    Optical Drive: HL-DT-ST BD-RE BH10LS30 SATA Bluray
    Lexmark S305 Printer/Scanner/Copier (USB)
    WEI Score: 8.1/8.1/8.5/8.5/8.25
    Asus Eee PC 1011PX Netbook (Windows 7 x86 Starter)

garaboldi

70-290
Member
Dwarf, That diagram was awesome. Thank you. Did what you said to do, and still nothing showed on the multimeter.
 

My Computer

System One

  • Manufacturer/Model
    Dell Latitude D530
    CPU
    Intell Core Duo T7250 @2.00 GHz
    Motherboard
    Not sure-Dont see it under Device Manager
    Memory
    4.0 GHZ
    Graphics Card(s)
    Mobile Intel(R) 965 Express Chipset Family
    Sound Card
    SigmaTel High Def
    Monitor(s) Displays
    Intel Mobile 965 Express chipset Family
    Screen Resolution
    1024x768
    Mouse
    Logitech Wireless
    Keyboard
    Standard PS/2 Keyboard
    Internet Speed
    64-130 Mpbs
    Other Info
    Also Running: Server 2k3 and Vista Business in VPC.

lordbob75

Lord of Bobs
Vista Pro
Gold Member
Garaboldi, I had the same problem with a brand new PSU I bought.

My guess is its busted. That was the problem with mine. Also, judging by the fact that you got nothing from the MM, that confirms it. (Or am I just throwing BS around? Any concurring opinions?)

~Lordbob
 

My Computer

System One

  • Manufacturer/Model
    Custom
    CPU
    Intel Core 2 Quad Q8200 2.33GHz
    Motherboard
    ASUS P5QC
    Memory
    2x2GB
    Graphics Card(s)
    NVidia GeForce 9500GT 1Gb
    Sound Card
    Mobo
    Monitor(s) Displays
    Samsung SyncMaster 206bw
    Screen Resolution
    1680x1050
    Hard Drives
    Samsung SP2514N ATA 250Gb 7200RPM
    Samsung [Model] 1Tb 7200RPM SATA2
    PSU
    Cooler Master Real Power Pro 750W
    Mouse
    Razer Lachesis
    Keyboard
    Razer Tarantula
    Internet Speed
    not fast enough

Brink

Staff member
mvp
Garaboldi,

I agree with Lordbob. If you got no reading with the MM, then it's time to get a new PSU. :(
 

My Computers

System One System Two

  • Operating System
    Windows 10 Pro 64-bit
    Manufacturer/Model
    Custom
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G7 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 970 EVO Plus M.2,
    250GB Samsung 960 EVO M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3
    Cooling
    Corsair Hydro H115i
    Mouse
    Logitech MX Master 3
    Keyboard
    Logitech wireless K800
    Internet Speed
    1 Gb/s Download and 35 Mb/s Upload
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Arris SB8200 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Lumia 1520 phone
  • Operating System
    Windows 10 Pro
    Manufacturer/Model
    HP Envy Y0F94AV
    CPU
    i7-7500U @ 2.70 GHz
    Memory
    16 GB DDR4-2133
    Graphics card(s)
    NVIDIA GeForce 940MX
    Sound Card
    Conexant ISST Audio
    Monitor(s) Displays
    17.3" UHD IPS touch
    Screen Resolution
    3480 x 2160
    Hard Drives
    512 GB M.2 SSD

Dwarf

The Contemplator
Vista Guru
Gold Member
One thing that I forgot to mention - was the wiring to this connector the same as shown in my diagram, i.e. the colours? Did you have the PSU plugged in and powered on for that test?

The reason for choosing this pin is that 5V is ALWAYS available here; this is what powers your system when it is sleeping (maintains the data in RAM) and allows other functions such as Wake On Lan, etc.

If you have no reading here, then it is likely that the PSU has failed. If this is the case, and I'm afraid that it is looking likely, then you will need to replace it. Fortunately, if it is a standard unit, this is simple to do. Make sure that the replacement is of equal or greater rating, preferably greater, than the old one.
 

My Computer

System One

  • Manufacturer/Model
    Dwarf Dwf/11/2012 r09/2013
    CPU
    Intel Core-i5-3570K 4-core @ 3.4GHz (Ivy Bridge) (OC 4.2GHz)
    Motherboard
    ASRock Z77 Extreme4-M
    Memory
    4 x 4GB DDR3-1600 Corsair Vengeance CMZ8GX3M2A1600C9B (16GB)
    Graphics Card(s)
    MSI GeForce GTX770 Gaming OC 2GB
    Sound Card
    Realtek High Definition on board solution (ALC 898)
    Monitor(s) Displays
    ViewSonic VA1912w Widescreen
    Screen Resolution
    1440x900
    Hard Drives
    OCZ Agility 3 120GB SATA III x2 (RAID 0)
    Samsung HD501LJ 500GB SATA II x2
    Hitachi HDS721010CLA332 1TB SATA II
    Iomega 1.5TB Ext USB 2.0
    WD 2.0TB Ext USB 3.0
    PSU
    XFX Pro Series 850W Semi-Modular
    Case
    Gigabyte IF233
    Cooling
    1 x 120mm Front Inlet 1 x 120mm Rear Exhaust
    Mouse
    Microsoft Comfort Mouse 3000 for Business (USB)
    Keyboard
    Microsoft Comfort Curve Keyboard 3000 (USB)
    Internet Speed
    NetGear DG834Gv3 ADSL Modem/Router (Ethernet) ~4.0 Mb/s (O2)
    Other Info
    Optical Drive: HL-DT-ST BD-RE BH10LS30 SATA Bluray
    Lexmark S305 Printer/Scanner/Copier (USB)
    WEI Score: 8.1/8.1/8.5/8.5/8.25
    Asus Eee PC 1011PX Netbook (Windows 7 x86 Starter)

garaboldi

70-290
Member
One thing that I forgot to mention - was the wiring to this connector the same as shown in my diagram, i.e. the colours? Did you have the PSU plugged in and powered on for that test?

The reason for choosing this pin is that 5V is ALWAYS available here; this is what powers your system when it is sleeping (maintains the data in RAM) and allows other functions such as Wake On Lan, etc.

If you have no reading here, then it is likely that the PSU has failed. If this is the case, and I'm afraid that it is looking likely, then you will need to replace it. Fortunately, if it is a standard unit, this is simple to do. Make sure that the replacement is of equal or greater rating, preferably greater, than the old one.

Dwarf, Yes the coloring was the same are your diagram. I tired testing with the MM both plugged in and unplugged ( was unsure, and it wasn't going to hurt anything).


Before I order a replacement, I have to ask. Are the replacement units basically all uniform? (Size,cable connections and such) I'm only asking after looking at some 350 models on tigerdirect.com. They have there models with the fan on top of the unit.

If I install it as is, the blower will be up against the outside case of the tower. That is never good. So I'm asking before I buy.
 

My Computer

System One

  • Manufacturer/Model
    Dell Latitude D530
    CPU
    Intell Core Duo T7250 @2.00 GHz
    Motherboard
    Not sure-Dont see it under Device Manager
    Memory
    4.0 GHZ
    Graphics Card(s)
    Mobile Intel(R) 965 Express Chipset Family
    Sound Card
    SigmaTel High Def
    Monitor(s) Displays
    Intel Mobile 965 Express chipset Family
    Screen Resolution
    1024x768
    Mouse
    Logitech Wireless
    Keyboard
    Standard PS/2 Keyboard
    Internet Speed
    64-130 Mpbs
    Other Info
    Also Running: Server 2k3 and Vista Business in VPC.

lordbob75

Lord of Bobs
Vista Pro
Gold Member
One thing that I forgot to mention - was the wiring to this connector the same as shown in my diagram, i.e. the colours? Did you have the PSU plugged in and powered on for that test?

The reason for choosing this pin is that 5V is ALWAYS available here; this is what powers your system when it is sleeping (maintains the data in RAM) and allows other functions such as Wake On Lan, etc.

If you have no reading here, then it is likely that the PSU has failed. If this is the case, and I'm afraid that it is looking likely, then you will need to replace it. Fortunately, if it is a standard unit, this is simple to do. Make sure that the replacement is of equal or greater rating, preferably greater, than the old one.

Dwarf, Yes the coloring was the same are your diagram. I tired testing with the MM both plugged in and unplugged ( was unsure, and it wasn't going to hurt anything).


Before I order a replacement, I have to ask. Are the replacement units basically all uniform? (Size,cable connections and such) I'm only asking after looking at some 350 models on tigerdirect.com. They have there models with the fan on top of the unit.

If I install it as is, the blower will be up against the outside case of the tower. That is never good. So I'm asking before I buy.
Not quite.... The main thing you need to check is whether your mobo is a 20 or 24 pin power connector, and if it needs an extra 4 pin or not. Just open the case and count.

~Lordbob
 

My Computer

System One

  • Manufacturer/Model
    Custom
    CPU
    Intel Core 2 Quad Q8200 2.33GHz
    Motherboard
    ASUS P5QC
    Memory
    2x2GB
    Graphics Card(s)
    NVidia GeForce 9500GT 1Gb
    Sound Card
    Mobo
    Monitor(s) Displays
    Samsung SyncMaster 206bw
    Screen Resolution
    1680x1050
    Hard Drives
    Samsung SP2514N ATA 250Gb 7200RPM
    Samsung [Model] 1Tb 7200RPM SATA2
    PSU
    Cooler Master Real Power Pro 750W
    Mouse
    Razer Lachesis
    Keyboard
    Razer Tarantula
    Internet Speed
    not fast enough
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