PSU for Geforce 6800?

Hello there, I just recently bought an MSI Geforce 6800 (NX6800-TD128) but it seems to me my PSU won't support it

when I plug the card into my comp (and yes, I plugged in a molex connector onto the card) I see your typical MS-DOS PC-starting-up things, but I get some green boxes here and there.
Then it goes to load windows, and I see lots of gray, dashed vertical lines all over the screen, and they move too!
Then windows launches and I still see the lines, but that is when windows actually launches, because sometimes it crashes or shuts down while loading, otherwise windows will crash with a blue screen of death not too long after it was loaded.

I'm thinking my PSU won't support it, because I have heard the newer cards need more amp output from them.

here are my specs:
AMD 64 3200+ Processor
Asus K8V Motherboard
1 GB kingston DDR
MSI Geforce 6800 128mb (NX6800-TD128)
DURO 400W PSU

for now I'm using the same setup with a Geforce 5200 instead of the 6800, it all works fine

and here are the numbers of my PSU
+3.3Vcc +5Cvv +12Vcc -5Vcc -12Vcc +5Vccsb
28A 30A 11A 0,5A 0,8A 3A

so, is it really my PSU or could it be anything else?
if it's my PSU, what's the min amperage I should get?
and if so, what's a good PSU I can get somewhere that will ship to Mexico?

thanks