Graphics card gone bad?

[Game-a-holic]

Hello, I have a question. When I upgraded to Snow leopard on my mid 2007 20" 32 bit 128 mb vram, 2 GHz Intel Core 2 duo with 4 GB 667 MHz DDR2 SDRAM with chipset model:ATI,RadeonHD2400, Imac,
I started experiencing problems with my games.First of all I always meet the minimum requirements on everything it says. Once I get into the game every little detail is pixilated, I can see through walls, I can see through the edges of the map, I can barely see another character, and this is happening in all my games. Could this be the problem of a Graphics card gone bad? Or is it that Snow Leopard need a graphics update, or I have to old of a computer?
Thanks,
Matt
P.S I also want to upgrade to mountain lion, Should I or would it make the games worse?
And This is what halo looks like....

 

[iBookG4user]

Your MacBook Pro has the Nvidia 8600GT which is a faulty card. Apple does have a program to replace the graphics card http://support.apple.com/kb/TS2377?viewlocale=en_US&locale=en_US

 

[Game-a-holic]

Actually I have a Imac

 

[iBookG4user]

Hmmm, it does sound like the graphics card is going bad.

 

[Game-a-holic]

Hmmm, it does sound like the graphics card is going bad.

Well everytime we bring it into the apple store nearby they do not do anything about it, they say like, Clear out your hard drive! Or Get a new computer! Which I would not like to do. I guess they have never seen this problem before...

 

[iBookG4user]

Well everytime we bring it into the apple store nearby they do not do anything about it, they say like, Clear out your hard drive! Or Get a new computer! Which I would not like to do. I guess they have never seen this problem before...

It looks like you can replace the video card on your iMac, however it's a pretty in depth repair and you would need to grab a working video card off of ebay or elsewhere. Here's the repair guide.

 

[Game-a-holic]

It looks like you can replace the video card on your iMac, however it's a pretty in depth repair and you would need to grab a working video card off of ebay or elsewhere. Here's the repair guide.

Thanks, but could I get a video card and have the apple store fix it? I do not want to ruin my computer

 

[benkelly92]

The guys in the Apple Store will doubtful attempt anything like this out of warranty, especially with parts you bought online. If you can find an independent Apple repair or computer repair place that does Apple repair they may do it.

However in short, Apple won't do this for you without a ridiculous amount of money (they want you to buy a new Mac).