After uninstalling drivers for old vid card, USB ports...

1) wrong forum. I know it says "Support/Hotlines" but if you check the sticky it says here is where you report on your experiences with support/hotlines.

2) Based on what you said (which leaves out quite a bit of detail - like what the old PC is ('fairly old gateway' isn't very informative), the wattage and brand of the old PSU, etc.) yes, it is likely a new, quality, PSU will power the system. With more information on the system (CPU/RAM/HDDs/CD/DVD/etc.) one could possibly even make

However, there were 4 revisions of AGP, and (1x, 2x, 4x & 8x) and if your old gateway has a 1x, it'll never work. If its a 4x, it might (you'll have to check compatibility of the card vs the AGP on the mobo)

And one other bit: If the problem is that the new card needs too much power, what PSUs do to accomodate excess power draw is either 1) go up in smoke (and sometimes you get fireworks); or 2) drop voltages to everything so that things stop working because voltages are too low.

Mike.