I am on vista home basic and I have the nvidia geforce 7300 gs. I have had this for about two years. I reinstalled what I thought were new drivers for the card several weeks ago to fix another problem. I come home and boot up and I can't get the higher screen resolution that was on my computer 12 hours ago. It won't let me roll back the drivers either. I looked through all the other posts and I couldn't find anything that could help me. Thanks.
SanDisk Ultra SDSSDHII-960G-G25 960 GB SATA III SSD (System)
Crucial MX100 CT256MX100SSD1 256GB SATA III SSD (User Tree)
2 * Seagate Barracuda 7200.12 ST31000528AS 1TB 7200 RPM SATA II Mech. HD
Seagate ST1500DL001-9VT15L Barracuda 7200.12 1.5 TB S
PSU
Thermaltake Black Widow TX TR2 850W 80+ Bronze Semi-Mod ATX
Case
ThermalTake Level 10 GT (Black)
Cooling
Corsair H100 (CPU, dual 140 mm fans on radiator) + Air (2 *
Keyboard
Logitech G15 (gen 2)
Mouse
Logitech MX Master (shared)
Internet Speed
AT&T Lightspeed Gigabit duplex
Operating System
Sabayon Linux (current, weekly updates, 5.1.x kernel)
Manufacturer/Model
Lenovo ThinkPad E545
CPU
AMD A6-5350M APU
Motherboard
Lenovo
Memory
8 GB
Graphics card(s)
Radeon HD (Embedded)
Sound Card
Conextant 20671 SmartAudio HD
Monitor(s) Displays
Lenovo 15" Matte
Screen Resolution
1680 * 1050
Hard Drives
INTEL Cherryvill 520 Series SSDSC2CW180A 180 GB SSD
i had a similar problem, I resolved it by powering off the monitor at the mains for a minute or so. when I turned it back on, the resolution settings where available again.
note that just switching the monitor off by the front switch did not work.