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I've reinstalled OS X Mavericks from scratch twice on my (usually headless) Mac Mini, but it keeps locking up after ten or fifteen minutes of use - even just Safari browsing. I use Screen Sharing with the firewall off (for now - to rule that out as a cause of the problem).

I connected an HDTV to see what was going on when the Mini locked up and I saw this:

enter image description here

...which doesn't look good.

I've run a full 'memtest' in single-user mode, twice, and that says it's OK. I'll try AHT when I get the chance, but does anyone have any advice or suggestions as to the cause?

  • Looks like a graphics driver problem. Is there any messages visible with the Console.app tool after reboot? – Thorbjørn Ravn Andersen Mar 9 '14 at 21:46
  • Well, nothing that looks like any specific error regarding drivers. Looks like mostly startup messages and some screen sharing authentication... All I've done is install Mavericks and enable Screen Sharing. No other settings or software have been changed or installed. – Graham Mar 9 '14 at 22:02
  • It was a long shot. Has it ever worked as expected? What have you changed since then? (New RAM/harddisk/extra USB devices)? – Thorbjørn Ravn Andersen Mar 9 '14 at 22:04
  • I picked it up second-hand last week, and have upgraded it to 8GB Crucial RAM. Also added an SSD which is running with the original HDD as a Fusion drive. No USB devices connected other than the keyboard :) – Graham Mar 9 '14 at 22:07
  • Macs are very picky about SSD-drives. Try going back to the original HDD only. – Thorbjørn Ravn Andersen Mar 9 '14 at 22:37
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I eventually found that the problem was caused by not-quite-firmly-seated RAM.

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  • Crazy that memtest was OK but the GPU wasn't ok. Glad it was an easy fix. I'm always relieved, sometimes shocked, and often pleased when reseating RAM and/or reseating cables clears up reproducible glitches. – bmike Mar 12 '14 at 20:30

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