Hello. I just replaced a power supply on a Windows XP computer and when it boots up, the os loads just fine, the startup programs begin to load and during this the display settings automatically change from 800x600 32-bit color to 640x480 8-bit color. It has a GeForce 440 MX card and all the drivers and such are working fine. I've tried everything fix it, but am having a less than fun time. Any suggestions would be great.