New 9800GTX system problems.

I have just purchase a system with the following specs:

- AMD X2 6000+
- Geforce 9800GTX (512MB)
- Gigabyte GA-MA770 DS3 mobo
- Enermax 460W PS (EG465P)
- 4GB RAM
- Running windows xp

I have it hooked up to my 46" HDTV via the HMDI cable, but i'm having some issues:

1) For some weird reason when booting up the bios screen and xp loading screen the background is a bright green color.
It didn't used to be that way (it used to show up black as normal), but after the first time problem #2 happened (below) it started loading up in green every time.
The screen looks fine once it gets into windows, but it is quite annoying (and possibly a sign of greater problems?).

2) When i try to play Crysis with settings:
- Details: all medium
- Res: 1920 x 1080
It plays awesome of like 3-5 minutes (graphics look great, and really smooth, good FPS), after that it crashes.
The game kind of freezes, after mashing the keyboard for awhile it goes back to the menu, but everything is messed up and pixelated, but from this menu i can just about navigate back out of the game and into windows.
From this point windows seem to be running normally. (So PC doesn't completely crash)

I have downloaded the latest Nvidia drivers, and Mobo drivers, but this doesn't seem to change anything.

Any ideas? What should i do in order to pin point the problem?

Unfortunately i don't have another system with larger PSU lying around

Is there anyway to test the power usage of the system to make sure it is the PSU?

Also i'll add that i've now tested it all the way down to 1280×1080 res with all low graphic settings and it still crashes.

What's the max temp the card should be running at?

After a crash i run the Nvidia monitor to check the temp and it says the card is around 63-65. Is the NVMonitor tool accurate? If so this temp doesn't seem that high?
The case doesn't feel that hot (nothing compared to the temp my xbox 360 runs at).

Assuming it is the power supplier i'm guessing the shop where i bought the PC will let me trade up for a better spec, does anyone have an recommendations? I'm not really sure how to read the PSU details, except for the Wattage. What am i looking for (no pun intended)?

I'm not sure how to read the power table, but under the "+12V" column it says "1.5A/33A" and under the "-12V" column it says "0A/1.0A"

That's well within temp range for that card. They didn't make the card that big (+1.5" more than 8800's) for no reason...additional capacitors and such. The heatsink is huge on those things. Here is a pic of my new 9800gtx next to my old 8800gts 640:

carver is rite, IF UR PSU IS WORKING FINE. try ur card on some other frnds computer having a decent psu, no offence, ur psu is awesom too. but its just another suggestion. try it.

So turns out it was some kind of defect in the card.

I bought the PC back to the store, and they switched out the card for a new one, and no more crashing. Works great now.