Only boots to safe and VGA mode -

First off, I have no idea how this happened. My computer does auto updates, so it's hard telling if it updated or not. I got to my PC this morning and the monitor wouldn't come on (no video output). I rebooted, and after the Windows XP splash load screen finished it started loading the screen that you select the user on. It got about 2 frames in...I saw a mouse and a light blue screen...then it started flickering like crazy. The flickering got faster and faster until I finally rebooted again and tried to revert settings to last known good configuration. I was able to get a little farther on the login screen. Except this time it was very distorted and corrupt. Weird lines, circles, random colors and squares everywhere. One time I got a BSoD, but it was unreadable (distortion). It boots to safe mode, and VGA mode. I updated my graphics card (NVIDIA Geforce 8500 GT 512mb). No change. When in VGA mode, I've tried changing the "Colors" from 8 bit to 32 bit, and also tried changing the resolution...when doing either of those, the PC freezes and I get distortion and corrupt video again. I'm completely stuck. Can anyone help me?

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