Imac with vertical lines on screen and crash, HELP!

[Ciatzo]

Hi, so my imac from around 2009 crashed yesterday, while playing a free indie game. The game was not graphically intense, and the imac was running at no more than 50 degrees celsius. All of a sudden the screen became really blocky, like it stopped inbetween two frames, on half of the screen showing one frame, the other half showing a different frame. This in a checkerboard patern.

At first i tought it was just the game crashing, since it was a indie game. But when i used te power button to turn of and on the iMac, a random pattern appeared on the screen, and after about two minutes it whitescreened. I left it at the whitescreen for over 2 hours, but it didnt change.

[/URL][/IMG]

Then i started to worry. I looked up the problem, and found some threads.
After trying some methods. Since i dont have the apple hardware test disk anymore i couldnt run that, i did reset the nvram and pram, and boot it in safe mode. In safe mode it did boot, but there were these giant lines on the screen

[/URL][/IMG]




Also i can't acces the internet in safe mode, altough i don't know if this is normal.

I did just back-up all my stuff on the iMac, and will probarbly visit the genius bar sometime this week, but if anybody know this issue and how to fix it, please tell me.

I did attach a picture of the about this mac section.

 

[IA64]

Same old story here. It was a corrupted video card due to overheating.

It will boot under OSX safe boot or Bootcamp safe mode because the drivers aren't loaded.

In my situation, when I boot in safe mode and keep it for a while or try to load some video stuff, the lines disappear and reappear. I had to install iStats pro and push the fans to the max to keep the card under control.

I ordered another iMac since mine was a late 2009 but long story short, it was the video card in my case.

 

[CoMoMacUser]

I had a similar problem with my 2008 iMac, and the cause was a logic board that went bad.