You tried changing the resolution to something else too?
Tell me the specs of the monitor screwing up, size and make. LCD or CRT, I'm assuming lcd.
Tell me the make of the second monitor borrowed from a friend. Lastly, can you give me the make of your motherboard and off/onboard gpu?
Try out the crappy monitor on your friends computer if you haven't already. Don't chunk a good 19" wide screen LCD!
-Q