Video Card Problem in Lion, probably overheating.

Hey guys, I recently started having artifacts going around my screen, few kernel panics and many crashes, specially when running demanding video games. I have an nVidia 8800 GT and all my system is up to date. Tested the video card on a Windows PC and I got the same problems with video games.
What I'm observing is that the fan of the video card isn't spinning as fast as it should, so the system crashes a couple of minutes later of executing a video game such Assassin's Creed 2 (very demanding) and much later if playing Slayer HD Pinball (not demanding), so I think this is an overheating problem, plus, the fan isn't working as it should do so I think there is no doubts of overheating.
However, I would like to know if there is a way to force the fan of the video card spinning faster (or any solution for this problem). if so, please, let me know.
Thanks!
Ø3
PS: I'm on Lion 10.7.2

First up, you should blow air through the fan BACKWARDS. This will dislodge the buildup. Best if you use compressed air.
Next, in WIndows you should instal EVGA Precision. This will allow you to alter fan speed.
Easy enough to test your theory then, just crank fan speed to 100% and try playing a game tha usually gives you trouble.
If it still crashes, your card is dying and needs a trip to the oven. (google)
If upping the fan fixes the crashing, then you need to use Nibitor to mod the fan speed profile and reflash with the higher fan speed. (you actually mod the curve in terms of how it responds to various temps...do the test first before you worry about this)

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Can anyone tell me if this is indeed a video card problem?
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Today I uninstalled parallels to see if that might have had anything to do with my problem now but i think that's just wishful thinking.
Can somebody tell me if this is really about the video card? Thank you

Your appointment at the genius Bar in an Apple Store (anywhere in the world) for an evaluation is FREE, in warranty or out. Those guys put their hands on these Macs all day every day, and they are especially good at Physical and Power problems.
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*Hello, I have a Dual Quad-Core 2.8Ghz MacPro (Early 2008) with the stock ATI Radeon HD 2600 XT 256MB Video Card. I believe I am having the exact same symptoms listed on the topic "Mac Pro 2008 Video Card Problem".*
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Glad you solved your problem Gaunja. Here's an update on my own.
When last heard from I had diagnosed the failure of my displays to boot up to graphics card problem in my early 2008 Mac Pro with my stock ATI Radeon HD 2600 by swapping out the same card from my son's Mac Pro and seeing the displays boot up fine. Before heading off to the Apple store for a new card I reinstalled my suspect video card just to see what would happen. The displays booted up fine. Now, two weeks later, again no video display--black screens--no signal from the graphics card. I rebooted the computer several times to no avail and was, again, about to head off to the Apple store for a new card. This time "just to see what would happen" I moved the graphics card to another slot and bingo, the displays are up. What can be determined from my experience to date?
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Video card problem ?

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http://img.skitch.com/20081219-e1t87if23rjbhf66gy2dj2aux4.jpg
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Restart your MacBook and hold down on the "d" key for "diagnostics". This will startup the MacBook into the Apple Hardware Test. Run the extended tests. Let's see if you don't get an error when it checks the video system.
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Yo! Don't post the same question twice, OK?
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Two things to keep in mind
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