9 month old iMac with a SSDH hard drive that will go to sleep and not wake unless I cut the power and then restart with the on button on the computer. No matter if its 10 minunites or 2 hours. Just started this month.
304 GHz Intel Corei7, 8GB ram, runinng 10.7.3
iMac, Mac OS X (10.7)
Reset the SMC > Intel-based Macs: Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Reset the PRAM and NVRAM > Resetting your Mac's PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Recheck your Bluetooth Preferences if you are using wireless (keyboard, mouse or trackpad) input devices to wake the iMac.
it should never be required that you pull the plug
un the back of the screen in the lower left corner there is a button you can try pressing once
if that don't turn it on you can hold in the button for 10sec
I have the Bluetooth set to wake the computer, I've reset the PRAM and NVRAM, I have pressed the power button for 2 (two) minunites without it restarting, the only thing that works is to unplug for a few seconds then after plugging in hit the power button to start.
Out of curiousity do you have hibernate mode set? In terminal type (copy/paste):
pmset -g
If it shows hibernatemode is 1 then set it to 0.
sudo pmset hibernatemode 0
You will be prompted for your admin password. Enter it (it won't be echoed) and hit return
I set the hibernatemode from 3 to 0 and now when sleep I have to do a full restart to use the computer. Set the energy saver to never sleep and display to sleep 1 hour. I still do not understand why this happend all of a sudden. Normally when it went to sleep the mouse or keyboard would restart with no problem.
9 month old iMac
I think I'd have Apple check it out. You are still under warranty, unless the SSD is not original to the computer and not installed by an Apple Store or AASP.
The reason I suggested turning hibernate off was because there was a problem (the one you described) last year with hibernate sleep with OWC ssd's using the SandForce firmware. OWC eventually issued a firmware update.
I just was guessing that your ssd had the Sandforce firmware with that problem. Hence my suggestion.
So how did hibernatemode get to be 3 in the first place? Hibernate may make sense on a portable but I don't really think it is necessary for a desktop.
I'm new to the Mac world, having just bought the 27" iMac last year right before Mountain Lion was released. I always shut down my iMac whenever I'm done with it, and after reading some of these posts, not sure if this is the correct thing to do or not. My issue may be the same as above, but right after I purchased it, I had not used it within a few days, and when I went to turn it on, it would not come on. I took it back, and the techs unplugged it from the back of the machine, held in the power button for a few seconds, plugged it back in, and it came right on. I've found myself having to do this anytime the machine has been not used in a few days. I recently purchased a MacBook Pro, and the sales guy said that this was not normal. I don't know if I should take it back, and have it replaced, or if there is a setting I maybe need to reset???
I have a iMac with a SSD hard drive that will not wake unless I cut the power electrically an then power on with the on button
