White iMac don't wake from sleep

Hi,
I have a white iMac 17" that is working very well, except for one thing: if it falls on sleep mode, sometimes it won't wake up.
This computer had a Lion fresh install a few month ago, so I do not think it is a software issue. It looks like something hardware that makes it not wake from sleep.
any idea what's wrong and how to repair this?
Thanks

10.7.3 did not cause your problem. Log into another account on your computer and see if the problem is replicated. If you don't have a second user account then create one. If the problem isn't replicated then you have a software problem that you need to track down in your normal user account.

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Step 1
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Step 2
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If the checkbox at the bottom marked
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If you're running OS X 10.9 or later, select
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Step 3
In the Energy Saver pane of System Preferences, uncheck the box marked
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Step 5
This and the next step must be taken as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
In the Console window, select
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In the search box in the window's toolbar, enter "powerd" (without the quotes.)
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com.apple.message.signature: Platform Failure
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Step 6
In the Console window, select
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from the menu bar.
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This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
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/Library/LaunchDaemons
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Allowing the display to sleep is OK.
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Base model iMac 27 with just one option, the Apple 256GB SSD
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The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the icon grid.
If you don't see any reports listed, but you know there was a panic, you may have chosen Diagnostic and Usage Messages from the log list. Choose DIAGNOSTIC AND USAGE INFORMATION instead.
In the Console window, select
DIAGNOSTIC AND USAGE INFORMATION ▹ System Diagnostic Reports
(not Diagnostic and Usage Messages) from the log list on the left. If you don't see that list, select
View ▹ Show Log List
from the menu bar.
There is a disclosure triangle to the left of the list item. If the triangle is pointing to the right, click it so that it points down. You'll see a list of reports. A panic report has a name that begins with "Kernel" and ends in ".panic". Select the most recent one. The contents of the report will appear on the right. Use copy and paste to post the entire contents—the text, not a screenshot.
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IMac fails to wake from sleep

This is an ongoing problem that has been addressed by Apple Care and a Mac Shop. The hard drive, Logic Board, Ram, and Super Drive have all been replaced.
The Console gives a repeating message of:
8/26/08 8:43:07 AM com.apple.launchd[1] (com.apple.nis.ypbind) Throttling respawn: Will start in 10 seconds
8/26/08 8:43:17 AM com.apple.nis.ypbind[573] Domainname not set. Aborting.
8/26/08 8:43:17 AM com.apple.launchd[1] (com.apple.nis.ypbind[573]) Exited with exit code: 1
Does anyone have a clue?
Thanks!

An update:
The iMac just froze while the screensaver (album in iPhoto) was running. I had to force a shut-down with the power button.
Here is the Console message:
8/26/08 9:22:43 AM com.apple.launchd[1] (com.apple.nis.ypbind) Throttling respawn: Will start in 10 seconds
8/26/08 9:22:53 AM com.apple.nis.ypbind[203] Domainname not set. Aborting.
8/26/08 9:22:53 AM com.apple.launchd[1] (com.apple.nis.ypbind[203]) Exited with exit code: 1
8/26/08 9:22:53 AM com.apple.launchd[1] (com.apple.nis.ypbind) Throttling respawn: Will start in 10 seconds
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8/26/08 9:23:00 AM com.apple.quicklook[204] failed to find PDF header: `%PDF' not found.
8/26/08 9:23:01 AM quicklookd[204] * +[NSCalendarDate iso8601DateWithString:]: unrecognized selector sent to class 0xa04c6ce0
8/26/08 9:23:01 AM quicklookd[204] EXCEPTION NSInvalidArgumentException: * +[NSCalendarDate iso8601DateWithString:]: unrecognized selector sent to class 0xa04c6ce0
Does that give anyone a clue?
Thanks again!
Whit

IMac won't wake from sleep mode

Just wanted to share my experience in case anyone has this issue.
Computer would only start after sleep mode if I unplugged the power cord. The power button would not do anything, even if I held it for a long time.
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Very interesting, thanks for sharing.

White iMac don't wake from sleep

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