When my system comes out of sleep it reboots why

Sounds like another flaking out 2008 Mac Pro 3,1.
Troubleshooting: My computer won't turn on
https://support.apple.com/kb/TS1367
Symptoms
If your Macintosh computer won't turn on, here's how to troubleshoot it. Please keep in mind that although your computer may display similar symptoms that prevent it from showing video, this article discusses what to do if the computer won't turn on, meaning that when you press the power button:
You don't hear a startup chime.
You don't hear any fan or drive noise.
The power button or power indicator doesn't light up at all.
If your computer doesn't display any video, it may display one or more of these similar symptoms when you press the power button:
You may hear a startup chime.
You may hear fan or drive noise.
You may see the power button or power indicator light up.
If any of these conditions occurs, see Troubleshooting: My computer has no video instead.
Resolution
If your computer won't turn on, try each of these steps:
Make sure that the power cord is plugged into a working wall outlet, and that it's properly connected to the power adapter. (To check if the wall socket is working, plug in a lamp or other electrical device.)
Make sure that the power adapter is properly connected to the power port on the side or back of the computer.
Disconnect all accessories that are plugged into the computer, such as a printer, hub, or other mobile device.
Reset the computer's PMU, SMC, or PRAM. Refer to the instructions for your model:
Portable (iBook or PowerBook)
Mac mini
iMac
Power Mac
Mac Pro
MacBook or MacBook Pro
Other Mac computers
reset SMC For "Mac wont' turn on or boot" and related
https://support.apple.com/kb/TS1367
General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
Identifying resource hogs and other tips: Using Activity Monitor to read System Memory and determine how much RAM is being used
Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?
To identify potential hardware problems: Apple Hardware Test
General Mac maintenance: Tips to keep your Mac in top form

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CD Eject sound when MBP comes out of sleep

Perhaps this is typical - I'm a new convert from the PC world. But the only thing that I don't like about my new MBP is that the CD drive (when empty) makes the CD eject noise every time the machine comes out of sleep. Is this typical? What's it trying to accomplish? Is there any way to disable this behavior?
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Yes it's normal. It is the behaviour of the Matshita (Panasonic) drives as they are powered, which is what happens when you boot and wake from sleep. Unfortunately there's nothing you can do about it.

Monitor does not come out of sleep Mac-Mini Mini-DVI to Dual DVI-D cable

I have an August 2009 Mac-Mini that I'm using with an Apple supplied Mini-DVI to DVI adapter along with a DVI-D Dual Link Cable connect to a Sceptre X7XV-Naga+ LCD monitor.
The monitor is going into sleep mode on its own with no way to disable this feature on the monitor itself. I've disabled sleep mode on the Mac-Mini in the power setting in System Preferences.
When in sleep mode and I move the mouse or press a key, the monitor will not come out of sleep mode. From other posts, I read that the issue might be that I wasn't using a Dual-Link DVI-D cable, so I bought one and installed such a cable. That has not resolved the problem. The monitor will not come out of sleep mode. When I have the monitor connected with a mini-display port to VGA adapter instead of a DVI-D cable, it will come out of sleep mode every time.
Message was edited by: Annorax64

I know it's a year later, but I'm not finding much through search.
I have the same exact problem. Difference being I'm using an iMac with 10.7.5.
Same video board and monitor - ATI Radeon HD 6750M video card connected via DisplayPort to Samsing S24A850DW.
I've tried two different mini-DisplayPort to DisplayPort cables and no change.
I think I read that 10.8.3 might fix the issue. Anyone that can confirm that, or has another solution?

After maverick update mac won't come out of sleep

After I updated to Mavericks my macbook pro wont come out of sleep modes, I will close the screen or let the computer go to sleep from inactivity and i can see that its breathing but it wont come out of sleep mode and than requires a hard shutdown. It also takes a very long time to reboot and/or restart as it sits on the gray

Sadly, I had the issue resurface today. It went into standby/sleep mode while I was in a meeting (on battery power), and later I tried to wake it, and all I got was a black screen with a mouse cursor.
The keyboard brightness and volume keys on the keyboard were responsive (I could hear the audio level clicks as I changed it), but the visual overlay didn't show (where it shows the white speaker graphic with the bar of rectangles representing volume level). Also, the screen brightness keys did nothing.
I finally used Ctrl + Cmd + Power to force a restart. Luckily, my user account didn't get completely hosed like it did a couple weeks ago.
So, it looks like Migration Assistant isn't the culprit here. This is the system I just finished rebuilding. So it's either a bug in OS X/Mavericks, or it's due to an application I have running, or a configuration change I've made.
It seems to only happen when I'm on battery power, for what that's worth. I don't recall it ever happening when I'm plugged in. I have Power Nap disabled while on battery power, btw.
I'm going to enable SSH access so I can try to SSH in the next time this happens. Perhaps that will provide useful diagnostic info.
Anyone have any tips or suggestions?

Microsoft Word crashes when Mac is coming out of sleep

On both Microsoft Word 2008 (and Excel) I get crashes whenever the Mac comes out of sleep mode or I unhook my extra monitors. This is on Yosemite, 10.10.2, but goes back for quite some time, and I am running on MBPro Retina 15" first gen. It seems like a rendering issue if the screen buffers get changed around in some way. Has anyone encountered this at all?

I used to have the same problem several OS points before and it suddenly stopped occurring. After the last update (10.4.9), it started happening again. Basically, when I close the laptop cover, it goes to sleep. WHen I open the cover, it occasionally remains with the screen black. I can't figure out the cause. I have reset the PMU, NVRAM.
The only other thing that I noticed is that the ENergy Saver preferences are no longer followed on my system. For example, I have the setting to 'sleep' at 15 minutes of idle. It never kicks into sleep by itself.
I am not sure if it has anything to do with the latest OS update. It may be a coincidence. Intuitively, I feel it is a hardware failure, but I am too lazy to test it out. I am waiting to get a new laptop, transfer my files and then wipe the hard drive clean with a fresh OS install to see if the problem persists.
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Hi arosecarter,
I understand your monitor is not coming out of sleep mode. Take a look at the following support document, Resolving Problems with Sleep and Hibernate Modes (Windows 7). Step 3 might be of particular interest to you, as you mentioned your keyboard and mouse are not really working for you either. Perhaps it is another connected device that is causing the issue? Anyway, hopefully this document will be of help to you. Best of luck. Have a wonderful day.
Ryan1216
I work on behalf of HP
The advice and opinions given here are my own and not those of HP

It doesn't come out of sleep mode. making me re-start it.

I have a MacBook Pro, A 2.33 GHz Intel Core,15". When I shut the lid, it won't come out of sleep mode. Making me have to re-start the computer. It started ever once in a while. Now it seems like every time. I tired if this problem. Is there any other MacBook Pro users having this problem. No, this is not my first mac. I've been a Mac user for over thirteen years. Please help... thanks Mac For life Moose

Never had this problem!
Weird...
but before you take it in to apple try restoring it on iTunes first. Or reseting it.
I would not be surprised if this was an original iPad but the second one!!!

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I just received my computer today. It seems as though they did not solve the problem. The first time I closed the laptop to put it into sleep mode, it would not come out of sleep mode. It would go to the windows screen, but it would not allow me to log in. I contacted support again and they told me that I should try to do a factory restore (again). They then told me that since this is a software issue and not a hardware issue that I would have to contact their paid service to get further help. This has been a very frustrating experience and I am on the verge of telling everyone I know about the poor service I've received. I was very happy with my system until about a month ago.
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hi okskate313,
Welcome to Lenovo Community Forums!
Please try the steps or suggestions here
http://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/u310-touch-Wakes-from-sleep-then-goes-back-...
Regards
Solid Cruver
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MacBook won't come out of sleep mode.

My MacBook freezes every time I try to wake it after I put it in sleep mode. I have to restart my computer to get anything to work. I upgraded from Snow Leopard to Mountain Lion 10.8.2 and never had a problem before. Are there any fixes to this, other than never putting my MacBook to sleep.

Here is the output.
Index Refs Address            Size       Wired      Name (Version) <Linked Against>
   95    0 0xffffff7f81062000 0x5000     0x5000     com.logmein.driver.LogMeInSoundDriver (1.0.0) <94 5 4 3>
   96    0 0xffffff7f81001000 0x18000    0x18000    jp.co.be-grace.MCT_Trigger1p (2009.06.16) <67 33 5 4 3>
I don't know what all that means. I have previously removed the LogMeIn program by dragging it to the trash. I don't use it any more. Also I did boot in the guest account and it wouldn't come out of sleep mode. To be more specific, when I hit a key to get out of sleep mode all I get is the color wheel spinning on the screen as if it is trying, but nothing else happens. I have to reboot the computer for it to work again.

MacBook Pro comes out of sleep mode while lid is closed

Hey guys,
I have a MacBook Pro that is slightly over a year old. I'm running Leopard 10.5.5, and I have a strange problem where the computer comes out of sleep mode while the lid is still closed. This happens without any USB plugs being inserted or removed. Basically it just comes out of sleep (I can tell because I can hear the hard drive spin up as well as the noise the cd-drive makes when it's woken up), then it seems to realize that the lid is still closed and goes back to sleep. This used to happen somewhat infrequently, but I got fed up when this happened today about 10 times in a row as I was trying to study for an exam.
I have applecare so I'm not worried about having to take it in, it's just a strange, annoying problem. I have not been able to find anything from searching google or the help forums, so if anyone knows what could be causing this and how I can fix the problem it would be greatly appreciated.
Thanks
Message was edited by: SFR6

I did as you said, and I think I found the perpetrating program. It showed:
"11/28/08 11:41:24 PM [0x0-0xb90b9].com.apple.Safari[1261] Fri Nov 28 23:41:24 Macintosh-37.local Safari[1261] <Error>: Invalid JPEG file structure: SOS before SOF\n"
Any idea what this means? The only other thing that showed up as an issue was:
"11/28/08 11:42:16 PM iCal[1267] * Assertion failure in -[CoreEventResizeTracker mouseUp:sender:], /SourceCache/iCal/iCal-1270/iCal/src/calendar-views/x-days/CoreEventCreationTra cker.m:697"
or
"11/29/08 12:19:34 AM com.apple.launchd[1] (com.apple.backupd-wake[1287]) Exited with exit code: 1"
I have no idea what this means, so if anyone can shed some light on it it would be very much appreciated.

Wont come out of sleep mode

Hooked up my new computer and cant get the monitor. I am just a little literate in computers. After reading other problem tried the f 10 and that did nothing. Everything seems to have power and i can hear the computer running. Help please!!

Hello , I understand that your new computer is not able to come out of sleep mode, and I would be happy to assist you in this matter! To correct this issue, I recommend following the steps in this document on Troubleshooting sleep and hibernate issues in Windows 8. This should help to enable your system to enter sleep mode without crashing. I also suggest resetting the default power schemes on your system by following the steps below: Step 1. Click the Start button
Step 2. In the search box, type "Command Prompt"
Step 3. Right-click Command PromptStep 4. Click Run as administrator
Step 5. At the command prompt, type powercfg /restoredefaultschemes and press Enter reference: http://superuser.com/questions/669571/windows-8-1-64-bit-power-schemes-gone Please re-post with the results of your troubleshooting, and I look forward to your reply!
Regards

My laptop won't come out of sleep

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Brand new out of the box this shouldn't happen. Bring it to an Apple store or AASP.

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Hi
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Hi
I have installted 11.5.5 APPS on NT SERVER ,Service pack 6, 256 MB RAM, P4 Mechine
but when i try to login first time, the system pops up with the second login
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Why is it asking for the second time login.
, after the login, when I click on any module option , the system comes out
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also let me know what are the minimum services required and ther functionality
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When my system comes out of sleep it reboots why

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