To sum it all up,
the system turns on, but i get no video signal, and after about 20 seconds the system cuts out. It randomly started before when i had no power whatsoever, which was then fixed by replacing the PSU.
My motherboard is a biostar N4SLI-A9, (for more detailed system specs go here: https://secure.newegg.com/NewVersion/WishList/WishDetail.asp?position=HISTORY&ID=1802414&WishListTitle=Am+I+Missing+Anything%3F
The origional PSU i had was a 500W Antec Smart Power 2.0, then i replaced it with a 350W Antec Smart Power 2.0
uh, if you need an extremely detailed account of what happened, go here: http://dvdrom-guide.com/forums/showthread.php?p=77949