Recently, and in rapid succession, I did the following:
-had a bad hard drive replaced
-restored from time machine backup
-upgraded from snow leopard to moutain lion
After all these changes were made (and it may have even started in between some of them, but they happened so close together that if it did, I didn't notice), I am intermittently having difficulty waking the computer from sleep. This is usually when it has been unused (and asleep) for some time. I wiggle the mouse & give a click (which is what I usually do to wake... actually, before all the changes, it would wake with just movement of the mouse, now it seems I must either click the mouse or press a key on the keyboard, no matter what)... nothing happens. Press a key on the keyboard... nothing happens. Give a quick press to the power button... It makes a noise like it is waking, but the screen stays black. (The waking sound has changed since getting the new hard drive, too - a kind of troubling whir, almost grinding. It makes that noise, too, but doesn't wake.) I go through all this several times... nothing happens except the sounds. I walk away, come back maybe 10 or 15 minutes later & it usually will wake right away at the first mouse click.
This problem has been going on for a couple of weeks. The computer has been powered down & unplugged several times in between.
I have read a lot of posts just now about similar problems... and lots of different solutions. I am a novice & not really sure where to start. Here is the readout I get in Terminal when I type "pmset -g":
Currently in use:
|sleep||60 (sleep prevented by 1389)|
I would be grateful for any guidance! Thank you!