New 9800 GTX, - Certain Textures are the Wrong Color!

Hi, I am posting this question in the hopes that someone has heard of this before:

I just got a refurbished EVGA 9800 GTX off of Newegg (at $130 - quite a steal). I tested it in Call of Duty 4, and in GTA San Andreas, but when I went to play Portal something strange happened;

In portal, 90% of everything looks like it should, but some wall textures show up multi-colored/neon purple. On top of that, the "liquid" textures all appear to be a dark maroon, where before they were green. The textures look completely out of place due to the colors, but the effects such as reflection and bump-mapping appear to still work. This only occurs in specific parts of the levels, not all the time or even most of the time.

I am concerned that there may be a defect in the card, and I'm wondering if I need to return it - does anyone know what this could mean?

Thanks,
- Tripmasta

Intel C2D E6700
ASUS P5N-E SLI
EVGA 9800 GTX
3GB OCZ OC DDR2
Antec NeoPower 550W
MS Windows XP SP3
WD Raptor 32GB HDD, Hitachi Deskstar 500GB (x3) RAID5

it's a steam hl2 engine problem when you screw around in your settings. i bet the purple problem is gone when you just restart the whole portal game!

i have that problem when changing videosettings in game. just restart the game, and you will be fine!

yes my first +1

It hasn't happened in anything but Portal, but I've only had 24 hours to use the card so I can't say that I've tried much else (just CoD4 and GTA: SA)

- Tripmasta

If it's just something with the source engine, I am relieved. Thanks!

i have the problem on every system i use! it's when changing anti alliasing and resolution. so i think if you restart the steamgame, you won't see a problem again (if you don't change something again)

so did you try it back? portal