Strange graphic when booting up iMac with OS X 10.8.5

We just purchased a used iMac with following specs: OSX 10.8.5, 2.93 GHz Intel Core i7, 16GB memory. After installing some software, I was rebooting system. When I did, a strange graphic (not the Apple startup graphic) came onto the screen (moving image). Hard to describe - looks sort of like the 'test pattern' graphic. Nothing booted up while it was showing. I had to force quit the system. I powered up again, and all was fine. What does this mean?

It means you're in the wrong discussion. OS X Mountain Lion: Mac OS & System Software: Apple Support Communities

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You can return a new Mac within 14 days of purchase.
A new Mac is in warranty for 1 year from the date of purchase.
A new Mac comes with 90 days of free tech support from AppleCare.
AppleCare: 1-800-275-2273
Call AppleCare.
Best.

Holding down the option key when booting my iMac lo longer shows me my bootable external drives, the system just boots up to the main system. Also, holding down command, option,P,R no longer zaps the p-ram. the system just boots up.

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It could be your timing if on a bluetooth keyboard. I find it best to hit the keys as soon as i hear the chime, release and hit them again but this time holding them before the chime ends....like a fake pump in football.
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since the Yosemite update and the sequential patch, I've been experiencing lots and lots of issues with this releade
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Welcome to Apple Discussions!
Sounds like your graphics chipset needs repair. That's a logicboard related issue. I hope you have AppleCare. Because the logicboards for those machines cost a fair bit.

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To start, it is considered extremely impolite to type in all capital letters as you have done. Please use all lower case, or preferably properly capitalised text, in future.
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https://drive.google.com/file/d/0B6vGdX … sp=sharing
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Last edited by linuxuser21 (2014-12-09 05:52:05)

vi2nano wrote:nomodeset noapic noacpi nofb
Unfortunatly, this produced the same result; however pci=noacpi got me past the garbled screen. With this; however, I have no IDE hard drives or netork adapters.

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Strange graphic when booting up iMac with OS X 10.8.5

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