My iMac screen goes blank

[virtuosity]

Hi

My trusty 2008 iMac 27" has been superb, but after a while (dependent upon how graphically intense my usage is) the screen just goes blank / black. It still seems to be working (e.g. if I'm going through a playlist in iTunes at the time, that carries on playing, i can pause songs, restart them etc) so it just seems to be the screen / video - maybe the video card has gone

Before I take to apple store, just wondered if anyone has had a similar experience, and can throw any light on what it might be / might cost!!? Or know if there's a DIY option as I fear the cost of sorting by Apple might be more expensive than the item is worth!

 

[Ccwk]

Have the same problem with my iMac 2009. It appears to be the logic board or graphics card. Press ctrl+esc+eject then any key and it should bring your screen on again, at least until it happens again. Sometimes I can go several hours before blacking out, other times it happens every few seconds to where it is unusable.

I hooked up a Mac mini in target mode and don't have any issues so it isn't the monitor part of the iMac. Since my AppleCare expired I am just waiting for new Imac to come out to replace it.