Whenever I try to shut down my iMac (3.2 GHz Intel Core i3, running 10.7.3), it closes out all programs, goes to the gray screen with the spinning ball and just hangs there. This occurs in restart or shut down mode. Any thoughts?
IMac – 27″ iMac (fall of 2010) won’t shut down
imacmacosrestartshutdown
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Best Answer
Zap the PRAM and reset the CMS
A small amount of your computer’s memory, called “parameter random-access memory” or PRAM, stores certain settings in a location that OS X can access quickly. The particular settings that are stored depend on your type of Mac and the types of devices connected to it. The settings include your designated startup disk, display resolution, speaker volume, and other information.
Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
How to Reset Your Mac's SMC
The method for resetting your Mac's SMC depends on the type of Mac you have. All SMC reset instructions require shutting down your Mac first. If your Mac fails to shut down, try pressing and holding the power button until the Mac shuts down, which usually takes 10 seconds or so.
Mac portables with user-removable batteries (MacBook and most MacBook Pros):
Mac portables with non-user-removable batteries (MacBook Air and some late 2009 MacBook Pro models):
Alternative SMC reset for Mac Pro: If you have a Mac Pro that isn't responding to the normal SMC reset as described above, you can force a manual SMC reset by using the SMC reset button located on the Mac Pro's motherboard.