You should be careful of the fast that some Mobo that say they are AGP
1x/2x/4x don't actually accept newer 4x/8x cards.
I had this problem serveral months ago with my computer and purchased a
new ATI 4x/8x Video Card. (ATI 9800). Unfortunately everything I tried
in the BIOS didn't work, only until I switch out the mobo did the card
work. This happens a lot with newer cards and older mobo.
I doubt it's an issue with the power supply unless you've got 4-5 fans,
HD, a DVD writer and a ton of stuff hanging off the USB ports(like mine
is). For normal purposes 200w is fine.
Also on some older mobo in order to turn on AGP x4 you need to open(or
close) a jumper. Some of the newer cards WILL NOT BOOT unless the mobo
has AGP 4x on in the initial boot squence. Try looking for that too.
>> Stay informed about: New video card killed the computer?