MacBook Pro won't "wake" up after sleep mode!

I'm having this same problem.

It only happens when the lid has been closed.
It happens about 10% of the time.
The hard drive spins on when opening. Then nothing.
I have no peripherals.
The battery is usually full.
I have the latest OS updates (10.4.11)

Is Apple suggesting I need to purchase 10.5 to solve this problem?

If it's any consolation, the same thing is happening on my Intel Core2Duo iMac. Oftern (not always) won't wake up from sleep. Mouse, keyboard (wireless), remote have no effect.

I'm having the same problem as everyone else. I have a iMac G5. It starts up sometimes but most of the time it just sits there with a black screen. I tried reinstalling my OS and after I installed all the updates about 2 weeks later it started again. I'm running Tiger on a first generation G5 iMac. Apple fix please. I ran the terminal code as suggested several post up. I let you know if it works. Like I said it's so intermittent that I'll have to wait a day or so to tell if the problem is gone or not.

Application Enhancer seems to be the problem. I upgraded to a newer version. The terminal commands that I said I would try. Well I guess when the computer tried to go to safe sleep mode it just shut down. Anyone that tried it change 0 to 3 it will bring it back. Anyway like I was saying I believe it to be from Application Enhancer I just up graded to the latest one 2.0.3 If it doesn't work after that then I'm going to uninstall it.

This worked for me:
1) Shut down MacBook and remove the battery;
2) Hold down the Start button for ten seconds and then release it;
3) Reinstall the battery
4) Restart the computer
This procedure resets the MacBook's PRAM settings which contain many of the computer's basic settings, including the RAM disc which needs to be accessed for the computer to awaken.
For those having this problem on a desktop, see Apple's instructions for resetting your computer.

I have had the same problem. The computer sleeps and will not wake up. I read in one of these threads that the energy saving setting could be the source of the sleeping. I remember just having made a change.

The impact was dramatic. I unchecked the Wake Options: Wake for Ethernet network administrator access and uncheck Other Options: Automatically reduce the brightness of the display before display sleep. I have not had a problem in the last 24 hours. The day before I had to restart the computer 4 times. Give this a try. the only option I have checked in the Options tab is Show battery status in the menu bar.

I have had the same problem. The computer sleeps and will not wake up. I read in one of these threads that the energy saving setting could be the source of the sleeping. I remember just having made a change in the energy saver.

The impact was dramatic. I unchecked the Wake Options: Wake for Ethernet network administrator access and uncheck Other Options: Automatically reduce the brightness of the display before display sleep. I have not had a problem in the last 24 hours. The day before I had to restart the computer 4 times. Give this a try. the only option I have checked in the Options tab is Show battery status in the menu bar.

I replied to a thread where people were having the same problem, so I'm going to copy the post:
http://discussions.apple.com/message.jspa?messageID=6765992#6765992

One of the issues with the new Mac notebooks is something called SafeSleep. When you close the comptuer, SafeSleep which writes all the contents of the RAM to the hard drive before the machine actually goes to sleep. While it's doing this, it's recommended that you not move the machine, because this could corrupt the data being written or cause data to be written to an unintended location. The machine isn't actually prepared for transport until the light starts pulsating, and that typically takes about 30 seconds to a minute depending on RAM usage.

The problem with SafeSleep is that if data is being written to the hard drive when you close the screen, SafeSleep encounters an error that causes the machine to hang in sleep.

There is a UNIX command to disable SafeSleep, and this will allow your machine to go to sleep immediately when you close it. It should also reduce the chances that your machine will die in it's sleep, but consequently your machine will lose the ability to swap batteries and recover from where it left off, SafeSleep is what allows that. However, I don't swap batteries, so it's not really an issue for me. With SafeSleep disabled, the machine can be ready for transport in 2-3 seconds.

To do this command, you'll need to get into Terminal, Applications > Utilities > Terminal.

The Unix command to disable SafeSleep is:
+sudo pmset -a hibernatemode 0+

To re-enable SafeSleep, the command is:
+sudo pmset -a hibernatemode 3+

You'll then enter an admin password to authenticate the change.

This command has fixed my issues with the machine dying in it's sleep, hopefully it'll work for you guys.

Ditto the same issues. Won't wake from sleep mode. I have to hard reset at least once a day just to get the computer back after I open the lid. Sometimes, If I have the time and patience, I open the lid to a black screen and wait, and wait, and wait and after about 2 minutes the password screen comes up. I've been able to repeat this several times, but most of the time I can't wait that long. I hope Apple fixes this issue.

Hello,

I knew about the SafeSleep mode coming in. This was something new, some time back. But I was sure it was an "opt-in", not an "opt-out" feature. So, because of this issue (no full-wake problem) I realized my new MBP had it activated by default.

Since I don't care swapping batteries, etc ... and I TM save all my work before leaving a Location, I don't need SafeSleep. I have deactivated it with the 'pmset' procedure.

Since then - I keep my fingers crossed - I've not experienced that problem. As a precautionary measure, I do not connect my external display before to open the lid. I do that after the MBP has resumed activity.

What I can bring in here, is that I got that problem appearing always after having closed the lid and hurried my Mac into its sleeve and in my backpack. For sure, something bad happened when I tossed the Mac in the backpack while it was still tring to save that 2G chunk of data. Perhaps the accelerometer detected something "rough" happening and went conflicting with the SafeSleep save.

So. I won't say "It solved my problem", but it was truly helpful.

To know if SafeSleep is activated: check /var/vm for a large file named safesleep.

Rgds,

This happened frequently after 10.5.2 update.
I found this works for my MBP when I get a blank screen in wake-up:
- plug into external monitor through the dvi-vga adapter
- remove the plug and do it one more time
- this time press Fn key + F7 - twice
- then you can remove the connection to external monitor
Does that give a clue about how to fix this more permanently?

Mr. McApple wrote:
This happened frequently after 10.5.2 update.
...
Does that give a clue about how to fix this more permanently?

I've personally not experienced that problem since I've disabled Safe Sleep mode.

Whether this was incidental in solving the problem ... still, the two events match: Standard Sleep & Wake problem disappearance.

That's all I can say.

Rgds,
Thierry

I've disabled safe sleep.
Problem still occurs, and the only way I can avoid rebooting is still through an external monitor.

Apple is aware of this issue and is trying desperately to fix it. It does help them if you have apple care and call them about the issue. If you push the issue enough on the phone, you will be able to speak with a product specialist which can communicate with the Apple engineers that are trying to find the cause of the problem. Tell them as much as you can about your computer configuration such as programs, peripherals, and what you use it for on a daily basis. They can then use this information to try to re-create the issue and fix it. I have been in contact with a product specialist for about a week now and I am trying my best to help them find the cause of this issue. So far, we have ruled out safe sleep, iStat pro widget, safari, RSS vitalizer screensaver, system preferences, power management plist files as well as the systemuiserver plist file and systempreferences plist file. I have also ruled out bootcamp and having external peripherals connected. I have read most of the discussions on this topic and have tried everything suggested to fix the problem and got no good results. The problem lies within the operating system and will be hard to find, so it may be a while. I suggest waiting for a software update that will fix this but in the mean time, try to figure the problem out yourself and if you seem to have fixed it, then wait a week or so before claiming that you have found a fix. If after a week, your computer is running normally, then post it in the discussion and call apple care too. By letting a product specialist at apple care know what the problem is, they can bring it to the engineers and fix the issue for everybody through software update.

Update on my previous post: Resetting the SMC and PRAM does not fix the problem.