Why won't my iMac wakeup?

Sometimes my iMac will appears to remain asleep. When I sit down the computer will be completely quiet. After clicking the mouse or touching the keyboard, I can hear the hard disk wake up, but the display will not turn on. Any idea how to fix this?

Are you using the latest updates to the operating system and firmware updates (via Software Update)?
Sometimes it takes a few seconds for the operating system to activate the display so sometimes you need to wait a bit longer than other times (no idea what’s happening behind the scenes). I’ll assume it knows where to find your desktop wallpaper and screensaver images so there’s no problem there. Have you looked in your System Preferences/Energy Saver to review your settings? You could vary the odd item on or off to see if you get consistently good results. I check all boxes except ’Startup automatically after a power failture’.
If everything seems well defined and you’ve already reset your SMC and PRAM as a precaution, you could run the Apple Hardware Test or just call Apple in case you have a serious problem.

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JesseC7 wrote:
My computer won't dect my built in camera. Just wondering why? ...
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(1) If the iSight Troubleshooting article Carolyn links above does not help (the proper "reset" suggested there often does,) applying the latest Combo Update for the Mac OS you use may correct your trouble.
For 10.7,x: http://support.apple.com/kb/DL1459
For 10.6.x: http://support.apple.com/kb/DL1399
Whichever you use, repair permissions immediately before AND after the update.
If you use a different Mac OS, search here http://support.apple.com/downloads/
If you cannot find the update you need, post back your Mac OS version and we will give you a specific link.
(2) If you need to post back, include info for which Mac and Mac OS you use. (If you like, you can include this info in your User Profile so you do not need to enter into every post you make.) Also, for this particular problem, please tell us whether you whether you have a Canon Scanner app in your  > System Preferences... > Users & Groups > Login Items.
Message was edited by: EZ Jim

Why won't my iMac wakeup?

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