Display Malfunction

[rufusdespot]

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.

 

[dai]

is the power supply big and good enough
in the device manager uninstall the card
reboot tapping f8
from the options choose vga mode
when windows finishes booting
disable a/virus
install the drivers
reboot the computer
if the problem is still there i would suspect the supply is not supplying enough power