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My MacBook Pro just started acting up. The screen will flicker and I end up having to reboot my computer. I can still move the mouse around, but that's just about it. Would you have any ideas what the problem may be?

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This is nearly impossible to answer without some details. Perhaps check the Console for anything suspicious? – houbysoft Jun 18 '12 at 2:03
More details would really be helpful. Is the computer still responding to keyboard input, are the fans running on high speed, is some special processing/application running – patrix Jun 18 '12 at 12:38


  • Run Mac in recovery mode (keep holding ⌘ cmd + R on startup), then try to Repair Disk and Repair Disk Permissions using Disk Utility.

  • As suggested in Mountain Lion Screen Freeze thread, try OnyX software which allows and to verify the startup disk and the structure of its system files, etc.

  • Run dmesg and check /var/log/system.log for more detailed errors.

  • Run Console app to check crash logs including backtraces if any.

  • Run newproc.d or iofile.d dtrace scripts to find anything suspicious (e.g. sudo newproc.d)

Apple.SE: Mountain Lion Screen Freeze
Apple Discussions: Mountain Lion Screen Freeze (over 177 replies)

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