alrighty, first off...please...PLEASE ...please?...do not start taking components out of computers and testing them on other things if you don't know what is going on. You could have fried your friends components, this being said because it has nothing to do with your RAM, this is a video problem.
more than likely this is a problem with the monitor refresh rate or resolution. when your computer starts and runs through POST, right after this start hitting F8 simutainously until a screen comes up. If you see an option for VGA mode, select that and when windows starts up, change your screen resolution to 800x600 and reboot (you can change this later).
if there is not an option for VGA mode, then boot into safe mode. When you get in, change your settings as I stated above and restart normally. hopefully this fixes your problem.