Screen only works in 640x480, Windows 64-bit

Hi guys, I'd really appreciate if anyone could give me some advice.

I'm having a seriously frustrating problem with my computer monitor/graphics card.
I have an LG flatron monitor. Every time I go to start my computer it switches off and the message "analog power saving mode" appears on the screen. I can't turn it on after that, unless I restart windows in 640 x 480 resolution. When I do this the screen flashes with red lines and doesn't fit properly.

I've checked to make sure all the cables are tight, tried system restore when all else failed, I even tried updating my graphics drivers but I can't get very far because the screen will turn off just as they're finished updating.

The problem only occurred when I was sitting on a crappy cooking website which required no power from my video card at all. It was perfect for the last two years up until then. Help! :(

(Some additional details, that probably won't help at all)

Name: NVIDIA GeForce 7500 LE
Chip Type: GeForce 7500 LE
DAC: Integrated RAMDAC
Approx total memory: 1017 MB
Current Display Mode: 640 x 480 (32bit) (60Hz)

Drivers:
Main driver: nvd3dumx.dll,nvd3dum
Version: 8.17.12.8562
Driver Model: WDDM 1.0
 
What is your System Specs, we can help you find a better card, what is your budget, and what do you need in a Graphics card?
 
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