My iMac developed the yellow spots and stripes, froze and won't restart

During use, my iMac has shown the yellow spots which then turned into 5 vertical stripes. I turn it off, waited, then tried to charge - unsuccessfully so I turned off again and zap the PRAM. but as it tries to open it, the small bar under the Apple icon progresses left right about 2/3 of the way across and then the gray screen of towers.

Try a startup by holding down the SHIFT key while starting up of the Mac.

Tags: Mac OS & System Software

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