Hello and welcome to Bleepingcomputer.
I see your post has not been answered in a few days, I also see you did not come back to supply the information you said you would provide us with the next day.
So I am not sure if you resolved your problem or not.
I will however provide a answer based on what you have already told us here.
There is a possibility your friends motherboard or system has a serious electrical error and his system may have zapped your video card, putting that card into your system may have zapped your system.
When you first boot up your system are you able to see at least the system BIOS screen?
It is not all too common to blow out the on-board video processor when installing a bad expansion card into the expansion slot, but it can happen.
Try removing the expansion card altogether from the system, make sure monitor is on the VGA port and attempt to boot system and try to get into the BIOS setup utility screen if at all possible.
If it fails to display on-board video, examine the power supply connections and make sure they are all connected and secure.
Make sure your motherboard is not shorting out anywhere to the computer case, sometimes the motherboard can shift when cards are added or removed, the board may have shifted creating a short near where the mounts are located.
Try moving the motherboard jumper to re-set your BIOS, most motherboards have those jumpers they are commonly located near the CMOS battery and are often labled CLR_CMOS
If all fails, that card may have bricked your motherboard.
Edited by MrBruce1959, 04 May 2011 - 10:28 PM.