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Computer goes Black

I start my computer and the desktop appears. Then a few minutes later the screen goes black. I hit several keys to wake up the computer and nothing works. I need to restart the computer with the start up button and the screen keeps going black after a few minutes of operation
I have a I-Mac with system 10.6.4
I reinstalled the system with Leopard Snow
I put the screen saver to never and still the same way
I use photoshop and the resolutions is very high but this just started and photoshop has been in a while
I don't know what to do anymore for this problem

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First thing

In reply to: Computer goes Black

First thing we need to know, is does this happen if you just start the computer and then let it sit. You don't do anything with it, it just sits there. And you aren't, by chance, getting a box in the middle of the screen with a message about needing to reboot the computer in a couple of different languages?

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How old is your iMac?

In reply to: Computer goes Black

How old is it? There are problems with capacitors on 3 to 4 yr old iMac G5's. Mine died a slow death, symptoms started much like you are describing. More info if you search internet on iMac G5. I found http://jimwarholic.com an informative site.

If after checking these out, you may want to save your data by removing the HD (of course Apple doesn't want you to do this, they want you to take it to their people and charge to do it) and connect to a working Mac with an adapter. I did this with one I found at http://jimwarholic.com/2008/11/universal-hard-drive-adapter-ide-laptop.php

I had already tried to transfer data to an external backup, using the dying system, it crashed in the middle of transfer so I lost data in my partition, but there were other user's data still ok so by removing the HD and using an adapter I was able to save that data. The HD seems to be ok though.

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It's not a G5

In reply to: How old is your iMac?

It's not a G5 because they say they're running 10.6.4. That means at the oldest it's one of the original x86 iMacs from 2006, which should have escaped the bad cap issue. Which isn't to say a couple of caps couldn't have gone bad, it's just less likely.

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FrontRow

In reply to: Computer goes Black

I faced the same problem and Starting and closing the FrontRow works for me.

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