Had a wierd graphics glitch...

Just had my first strange graphics glitch tonight. I was moving photos around in Aperture and listening to some music through iTunes, and also had Firefox open, when suddenly the menu bar turned into a bunch of random colored blocks and the computer slowed WAAAAY down, to the point I had to to a hard shutdown. The bottom did feel pretty hot to the touch, though iStat said it was running around 65C or so. First time it's happened, so hoping to not see a repeat.

If this happens again, you might want to check Activity Monitor and see if you have some process running amok in the background and hogging the CPU. This could possibly produce the heat and slowness you are describing. Be sure to select "All Processes" at the top when you do this. See if you can find and quit the rogue process. If you can, then your computer should calm down and run normally.
Good luck!

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    Thanks! Didn't see the check box.
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    news:[email protected]..
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    Now I backup everything and tried to reinstall OS X but to no avail, it kept doing the same thing.
    So I formatted the disk, zeroed it out and reinstalled Mavericks. Same thing keeps happening, which seem to indicate some kind of hardware failure, right?
    On one occasion it did start up but after a few seconds it froze, with heavy glitches (see picture attached - sorry it's upside down but it doesn't make a huge difference anyway!).
    I upgraded the iMac with new RAM a year ago or so, and 2 years ago it had a hard drive failure, so I replaced the HD. Never had any problems in general, apart from when I had to replace the HD of course. It's always been very stable and well behaved.
    Any idea what the problem could be? I'm not looking forward to having to fork out £1500 for a new one...

    http://www.apple.com/uk/legal/statutory-warranty/ may be worth reading before you visit Apple. I don't thibk you'd be the first to argue that an expensive, quality computer ought to last more than 5 years, albeit that say, mechanical hard drives inside might need replacing.

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