IMac (intel) Mountain Lion screen blank

My iMac screen has blanked (black). Currently showing "Loading Photos..." which happens when it goes into screen saver mode. I have tried pulling the plug and restarting to no avail. My previous iMac G5 failed in a very similar way and had to be replaced. Is this the same problem ie. design fault of vital components?

Further to my initial question above: I have been pressing random keys and found that F9 brings the display back but as soon as I try to click on anything it reverts back to black with the timer twirling. Any ideas?

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    Resetting your Mac's PRAM and NVRAM
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    David,
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  • How do I transfer my Quicken 2004 data from old MacBook to new Imac with Mountain Lion

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    OK: This information is VERY helpful!  Note my comments below:
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  • I have an iMac with mountain lion 10.8.3 with boot camp 5.0.2 .i installed windows 7 -64 bit with boot camp but the boot camp didn't install drivers for windows please guide me for trouble shooting .

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    Kappy wrote:
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  • My iMac running Mountain Lion can't see my iMac running Snow Leopard on my network.

    My iMac running Mountain Lion can't see my iMac running Snow Leopard on my network.  Both Macs work fine and the SL Mac can see and connect to the ML Mac.

    There isn't a script.
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    Open the Connection Doctor from the Window menu.
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  • I have to upload video from my hewlett packard t200 camcorder to my mac. but mac won't recognize the camcorder files. i even bought flip4mac by tele stream which so far is useless. please help me use my camcorder with my iMac os mountain lion 10.8.2

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    That camera shoots H.264 in an .avi wrapper.
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    Upgrade to v9.4.1 or
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  • I updated my iMac to Mountain Lion. All the files were deleted. I have Time Machine backups. When I restart the mac pressing Command R to restore from backup it shows the previous OS X (Leopard) beside the date of the backup. Will it go back if I restore?

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