colour

Well, you should give information on the computer specifications.
"Has just gone" probably after installing something?

Have you tried restarting in safe mode? To see if it's black and white in there too. Keep pressing F8 before the loading screen at the computer's startup and choose Safe Mode.
 

My Computer

Have you tried another monitor?
 

My Computer

System One

  • Operating System
    Windows 7 Pro & 10 Pro
    Manufacturer/Model
    HP Pavillion Elite HPE-250f
    CPU
    Intel i7 860 Quad core 2.8 ghz
    Memory
    8 gb
    Graphics card(s)
    ATI Radeon HD 5770 1 gb ram
    Monitor(s) Displays
    Alienware 25 AW2521HF
    Screen Resolution
    1920x1080 &1680x1050
    Hard Drives
    1 TB & 500 GB
    Other Info
    https://www.cnet.com/products/hp-pavilion-elite-hpe-250f/
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