Display going haywire/freezing

frequently/regularly when i'm working in iphoto, my screen goes completely haywire, and in a minute or 2 my entire desktop/display also goes digital and pixelly. It will quickly freeze up entirely, and I have to manually re-start my computer. I'm not having this problem with any other appplications, though. someone suggested a video card problem may be causing this- any thoughts?

Hi
With the symptoms you described this could well be a video card problem. It may be that showing photos on screen witch may be large, is taking the the card to near breakdown. On a windows Pc this was usually a fan problem forcing the chip to get hot. Have you done the apple hardware test to see if you have problems with the mac, also if you have tech-tools run a scan. Hopefully you have just got the iMac and you could take it back and show somebody in the appleshop the problem. You can check the heat, fan speed etc with the excellent program iStat Pro at http://www.islayer.com/apps/istatpro/
this may give you a few clues as to the problem.
Message was edited by: Shylock1966

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Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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Check this!!!

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Display going haywire/freezing

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