Can't wake Mac from sleep.

This is a new problem. Yesterday, when I tapped the keyboard to wake my iMacG5 (Dec., 2004), she went black. ON button no help.
Unplugged power cord, replugged, then ON button. She fired up.
Instead of putting Mac to sleep at the end of the day, I shut it down. This morning, used the ON button to get it going. No problem.
But later, when I used Sleep, the same thing happened. Touching the keyboard did not wake her up. Black screen again. Unplug and replug again.
Any ideas or does this require a trip to the Genius bar?
Thanks!

Unplugging and replugging essentially resets the SMU, so it seems the you are at the beginning of a power/thermal problem. See if you qualify for Apple's Repair extension programs, they will say that it's only good for three years after the date of purchase, but try a little gentle persuasion and see if you can't make them help you.

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Since 1 month or so my laptop is not able to wake up from sleep when I open the lid. The screen just stays black and I have to do a hard reset in order to use the computer again. Called apple help center and they made me repair permissions on the disk utility as well as re-installing mavericks, but it didn't change anything. This problem occurs maybe 4 or 5 times out of 10. Before the last update of mavericks I didn't had this problem.
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Step 1
Take all the applicable steps in this support article. That's the starting point for any further efforts to solve the problem. Please read the whole article carefully (some of it is hidden by disclosure triangles) and don't skip any of the steps, including the ones under the heading "Additional troubleshooting." If you don't understand any of the steps, ask for guidance.
Step 2
If you're running OS X 10.8.5 or earlier, from the menu bar select
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If you're running OS X 10.9 or later, select
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Step 3
This step must be taken as an administrator. If you have only one user account, you are the administrator.
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from the menu bar. 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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Frank and All,
The following answer to your question above is complicated, but I hope it explains why my question was formed with so much frustration in it.
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