Manually "sleeping" my MAC results in a state where I cannot wake it

I'm running 10.5.6, and if I manually sleep my iMAC, I cannot wake it. Only solution is to push and hold the power button for around 10 secs (or unplug the unit) and then power back on.
Solutions?
- Greg

I don't normally "sleep" my Mac. Today a family member visiting manually put it to "sleep".
When I tried to wake the Mac .... the USB hub came to life (lights) .... the scanner warmed up and reset, but the screen was dark and the keyboard/mouse dead.
I had to shut it down with the power button and restart. I have never had this happen before, but it is quite rare for me to "sleep" my Mac.

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I have a small annoyance with my 2009 (Nehalem) Mac Pro I am wondering if someone can help with, or suggest something, please:
The Mac Pro does not auto-sleep; ever. I have played around with the sleep time settings, and enabled or disabled the 'sleep drives' option, but to no avail. Mac Pro will stay on, no matter if I am logged on OR even on the 'log on users' screen.
That said, I can sleep the Mac Pro manually at any time, and without any problems; it stays asleep without a hitch, and wake-up is flawless.
There is nothing in the console log that would tell me why the auto sleep doesn't function. I deleted the sleep plist and re-set, but again, no change.
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Exactly the same problems as those described above: forced sleep works (by using the power button or closing the lid) but automatic sleep doesn't (using 'Energy Saving' preferences).
Tried every single piece of advice here and on other posts: reset PRAM/ SMC, verified disc, repaired permissions, deleted the power saving preference files, cleared caches & history, restarted in every conceivable mode... The only things that worked were safe boot and creating a new user account which means it must be a software issue.
Disabled/ removed/ paused/ reinstalled every piece of software I could but to no avail. The most frustrating thing? Having to wait for 5 mins every time I tried something to check whether the damned thing was going to go to sleep.
In the end, and in desperation, I took the advice of Dino X and downloaded PleaseSleep. Success! A genius piece of software. It forces sleep when the Energy Saver preferences cut in but, even if I don't set exceptions, it won't force sleep if there's a DVD playing (for example).
Only had the Mac for a few months and I'll never go back to that other, unmentionable operating system; the Mac's just too good but I'm vexed that I'm having to use third party software to get it to work as it should (and was) - feels like a bit of a Win*s solution to me.

Hello, I have a Macbook Pro 2011, and put an SSD on it. Yesterday i upgrade to Yosemite and sadly mi trim is not supported .... I really need (and demand) a solution to this, because like i see in the manual of the mac, Iam allowed to install a disk.

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Try a Safe Boot to clear the dyld_shared_cache (dynamic loader cache)
SafeBoot http://support.apple.com/kb/HT1564
Safe Boot, which automatically rebuilds this cache (among other things).

Auto-sleep, okay. Manual sleep, and it wakes back up. ???

My iMac keeps waking itself up after I set it to sleep. It only stays asleep if the auto-sleep time runs out in the power saver under system preferences. Why won't manual sleep (through the apple menu) work?
Message was edited by: Enio Rigolin2

Hi Enio
First eject and disconnect any External HD's, iPod's, iPhone's, iPad's, other USB devices, turn off your printer and see if it will sleep.
Next reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer+
Then if that does not help, see > http://support.apple.com/kb/HT1776
Dennis

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1. To create a new login, open system preference folder and open accounts. Unlock by clicking on the padlock icon. Now click on the plus icon which will allow you to create a new login name and password. Tick allow user to administer computer. Lock the padlock again and close window.
2. Go to apple logo top left of screen and logoff your username - you will be prompted shortly with choice of logins and choose the new one - you get a fresh screen which looks like when you first switched on the mac. You can test iweb here by publishing any old template to see if it works. It should do. Assuming all is ok, this next is how to publish your existing site.
3. Go back to your normal login. Find the domain file and copy it to dvd - domain file can be found as follows: open finder > click on house icon (yourname) >click on library >click on application support >click on iweb and here you will find domain file - copy it.
4. Log out and log on to new login again - find domain file in this system and delete it then in its place put your copy domain file from the dvd. When you open iweb in this system you should see your web files and hopefully you should now be able to publish them. This is where I succeeded.
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2. Change your standbydelay to 86400    86400 is number of seconds which is 24 hours. Here’s the command:
sudo pmset -a standbydelay 86400
3. Change autopoweroffdelay to 86400 Here’s the command:
sudo pmset -a autopoweroffdelay 86400
4. At last but not least change autopoweroff to 0   Here’s the command:
sudo pmset -a autopoweroff 0
Run pmset -g to verify your setting have changed. I rebooted my system and checked again to make sure. Since I made the changes no more going into Safe sleep!!! You can change the values to what you like. I used 86400 secs. (24 hours) I hope this helps!

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I've got a Xeon Quad Core Mac Pro, running 10.5 Server (10.5.5 to be specific)
This computer provides services for a small office network, and I've disabled sleep, but it still goes to sleep sometimes. I went into System Preferences --> Energy Saver and disabled sleep. Below you can see in system.log when the computer went to sleep this morning. How do I definitively disable sleep?
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Here's the output of pmset:
sh% pmset -g
Active Profiles:
AC Power -1*
Currently in use:
sleep 0
displaysleep 5
autorestart 1
hibernatefile /var/vm/sleepimage
hibernatemode 0
powerbutton 0
womp 1
disksleep 0
ttyskeepawake 1
system.log
Jan 15 10:54:18 hostname watchdogtimerd[44]: Automatic reboot timer disabled for sleep.
Jan 15 10:54:18 hostname kernel[0]: AFPSleepWakeHandler: going to sleep
Jan 15 10:54:20 hostname kernel[0]: Intel8254x -- Link Down -- 00:1f:5b:3a:5d:38 -- called by disable() --
Jan 15 10:54:20 hostname configd[29]: AppleTalk shutdown
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0xcde1
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x3800
Jan 15 10:54:20 hostname kernel[0]: -- PHY Specific Status Register (17d) = 0xaf08
Jan 15 10:54:20 hostname kernel[0]: Intel8254x -- Link Down -- 00:1f:5b:3a:5d:39 -- called by disable() --
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0x0
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Jan 15 10:54:20 hostname kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x0
Jan 15 10:54:20 hostname kernel[0]: -- PHY Specific Status Register (17d) = 0x8000
Jan 15 10:54:21 hostname kernel[0]: System Sleep
Jan 15 11:11:45 hostname kernel[0]: System Wake
Jan 15 11:11:45 hostname kernel[0]: Previous Sleep Cause: 5
Jan 15 11:11:45 hostname kernel[0]: USB caused wake event (EHCI)
Jan 15 11:11:48 hostname kernel[0]: Intel8254x -- Link Up -- 00:1f:5b:3a:5d:38 -- called by interruptOccurred() --
Jan 15 11:11:48 hostname kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Jan 15 11:11:48 hostname kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0xcde1
Jan 15 11:11:48 hostname kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Jan 15 11:11:48 hostname kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x7800
Jan 15 11:11:48 hostname kernel[0]: -- PHY Specific Status Register (17d) = 0xaf08
Jan 15 11:11:48 hostname kernel[0]: Intel8254X -- Negotiated Speed: 1 Gb/s, Duplex: Full, Flow Control: Receive Pause Enabled,
Transmit Pause Enabled
Jan 15 11:11:50 hostname kernel[0]: Intel8254x -- Link Down -- 00:1f:5b:3a:5d:39 -- called by enableHardware() --
Jan 15 11:11:50 hostname kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Jan 15 11:11:50 hostname kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0x0
Jan 15 11:11:50 hostname kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Jan 15 11:11:50 hostname kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x4000
Jan 15 11:11:50 hostname kernel[0]: -- PHY Specific Status Register (17d) = 0x8040
Jan 15 11:11:50 hostname kernel[0]: AFPSleepWakeHandler: waking up
Jan 15 11:11:50 hostname watchdogtimerd[44]: Automatic reboot timer re-enabled.
Jan 15 11:11:48 hostname /System/Library/Frameworks/ApplicationServices.framework/Frameworks/ATS.framewo rk/Support/ATSServer[2
34]: ATSFindFolder timeout. (domain:-32763, dirType:'font', createFolder:false, ATSServer pid:234)
Jan 15 11:11:51 hostname configd[29]: AppleTalk shutdown complete
Jan 15 11:11:51 hostname configd[29]: AppleTalk startup
Jan 15 11:11:51 hostname com.apple.KerberosAutoConfig[13606]: Kerberos configuration is up to date
Jan 15 11:11:52 hostname com.apple.KerberosAutoConfig[13611]: Kerberos configuration is up to date
Jan 15 11:11:53 hostname mDNSResponder[31]: Note: Frequent transitions for interface en0 (FE80:0000:0000:0000:021F:5BFF:FE3A:5
D38); network traffic reduction measures in effect
Jan 15 11:11:56 hostname configd[29]: AppleTalk startup complete
Jan 15 11:11:57 hostname com.apple.KerberosAutoConfig[13648]: Kerberos configuration is up to date

I found this at macosxhints:
#define kIOPMClamshellSleepKey "Clamshell Sleep"
#define kIOPMPowerButtonSleepKey "Power Button Sleep"
#define kIOPMSoftwareSleepKey "Software Sleep"
#define kIOPMOSSwitchHibernationKey "OS Switch Sleep"
#define kIOPMIdleSleepKey "Idle Sleep"
#define kIOPMLowPowerSleepKey "Low Power Sleep"
#define kIOPMThermalEmergencySleepKey "Thermal Emergency Sleep"
not sure which one would be cause 5 - but interesting that there is a tag for Low Power Sleep as well as Thermal Emergency Sleep - perhaps you need to monitor the temperature of the machine and or the quality of the power on the line.

Manually "sleeping" my MAC results in a state where I cannot wake it

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