IMac keeps going to sleep

Hi there.
I bought a second hand Rev. A G5 2 months ago. It has always been noisy - loud fan and a whiny noise. It's a bit annoying but I can live with it.
My major problem is the computer falls asleep by itself. It's unpredictable when it will happen but it does seem worse when it's been turned on for a few hours. It will wake fine once it's gone to sleep but will usually go back to sleep a couple of minutes later. I usually leave it for an hour or so and then it's okay. I have wondered if the noisy fan is linked to this. Is the computer overheating all the time? I tried resetting the SMU but that didn't really work.
Yesterday trying to import into iMovie was near impossible as it would keep sleeping - and the main reason for switching was because I liked the idea of iLife and using it to make DVDs of our old home movies and photos.
I'd like to get this sorted as I love my Mac (my friends say I've become obsessed!) but it's starting to get to me. I've read lots of posts about similar problems but there doesn't seem to be a solution mentioned.
Please help!

Hi
My kid's Rev A falls within these serial numbers but Apple refused to believe there was anything wrong and sent it back to my dealer untouched! The CPU fan constantly sits at a noisy 5600 rpm and the machine goes to sleep frequently during processor-intensive Flash games on the internet.
It's now back with my dealer in the hope he can convince Apple to fix it - although I am convinced the problem only started when I loaded Tiger - it ran quietly on Panther.
Having owned more Macs than I care to remember (and with a beige G3 still running 24/7 as a server in my office) - I really think this is software related rather than hardware. Apple kit has always been pretty reliable!
Hopefully soon I will know one way or another!
PowerBook 17" 1Ghz - too many others to mention! Mac OS X (10.4.3)

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In addition to resetting the SMC as Link suggests.
You should also check and/or clean-vacuum the dust out of your iMac's air intakes to make sure that it is cooling properly.

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If you still have AppleCare or it's covered under onf the G5 iMac extentions, and it turns out to be that... I sure think so.
Try some heavy lifting CPU wise with it, like making a big disk Image or burning one like before.
I don't remember the exact temp figures, but tyours does see high, iirc.
Looks like it is too high...
http://www.xlr8yourmac.com/systems/iMacG5cooling/imac_g5_coolingfan.html
90°C goes to sleep...
http://episteme.arstechnica.com/eve/forums/a/tpc/f/8300945231/m/515008370931/inc /-1
60-65°C good...
http://forums.mactalk.com.au/12/23696-imac-g5-cpu-temps.html

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Ran AHT - nothing wrong.
Did a full cleanup and verify as well.
probem persists.
Fan is always going
might have to go to an applestore..
max

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Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
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Couldn't hurt to check the hard disk.
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Click Verify Disk.
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Hello there
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This question was solved.
View Solution.

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Here is a link to download the drivers.
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9/20/14 11:10:56.482 AM loginwindow[495]: ERROR | -[LWBuiltInScreenLockAuthLion askForPasswordBuiltIn:] | Attempted to add an observer when already observing
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9/20/14 11:11:09.043 AM loginwindow[68]: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.
9/20/14 11:11:09.085 AM loginwindow[68]: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.
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9/20/14 11:11:26.602 AM loginwindow[68]: find_shared_window: WID -1
9/20/14 11:11:26.602 AM loginwindow[68]: CGSGetWindowTags: Invalid window 0xffffffff
9/20/14 11:11:26.602 AM loginwindow[68]: find_shared_window: WID -1
9/20/14 11:11:26.602 AM loginwindow[68]: CGSSetWindowTags: Invalid window 0xffffffff
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9/20/14 11:11:26.688 AM WindowServer[127]: device_generate_lock_screen_screenshot: authw 0x7fbd68432cf0(2000), shield 0x7fbd68578280(2001)
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9/20/14 11:11:57.886 AM loginwindow[68]: find_shared_window: WID -1
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9/20/14 11:11:57.984 AM WindowServer[127]: device_generate_lock_screen_screenshot: authw 0x7fbd68739610(2000), shield 0x7fbd68578280(2001)
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9/20/14 11:12:09.005 AM loginwindow[495]: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.
9/20/14 11:12:10.905 AM loginwindow[68]: CoreAnimation: warning, deleted thread with uncommitted CATransaction; set CA_DEBUG_TRANSACTIONS=1 in environment to log backtraces.

Resetting SMC doesn't work
Apple is dying
After 10.9.5 update,
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2. Wake up from sleep
3. After step 2, macbook keeps going to sleep per 5 to 20 seconds
4. After restart, back to normal
1 > 2 > 3 > 4 > 1 > 2 > 3 > 4 >...

Firefox keeps going to sleep (dormant) , I read an e-mail (30 to 45 sec) and go BACK and it takes 3 to 5 mins for FF to respond , flip up the window and it shows "connected-dormant" quarrymaster

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when I'm browsing a site or checking e-mail Firefox keeps going to sleep. this can be 30 sec to 1min in duration (the browsing) when I hit the back button nothing happens , so I click on the toolbar to open the Verizon wireless and it shows connected - dormant , according to Verizon I need a pinger or something to keep the browser alive or at least awake......Verizon say's their wireless constantly sends signals , so it has to be Firefoxes fault???? sometimes I click 3 to 4 times over a 3 to 5min period to get the browser going again

After 10.9.5 update, macbook keeps going to sleep

After 10.9.5 update,
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2. Wake up from sleep
3. After step 2, macbook keeps going to sleep per 5 to 20 seconds
4. After restart, back to normal
1 > 2 > 3 > 4 > 1 > 2 > 3 > 4 >...

Intel-based Macs: Resetting the System Management Controller (SMC)

Since upgrading to Yosemite my macbook pro keeps going to sleep if I am not using it. I want it to stay on as I leave it doing things overnight etc. It was fine before the upgrade and I have all the system preference set to "never turn off"

Since upgrading to Yosemite my macbook pro keeps going to sleep if I am not using it. I want it to stay on as I leave it doing things overnight (cd's / recording etc. It was fine before the upgrade and I have all the system preference set to "never turn off" - Help !!!

Good advice from Linc Davis that should sort out your query i think...
However you dont want to set your MBP to never go to sleep...
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HP pavillion Elite HPE-541F ... system will not start and monitor keeps going into sleep mode

Good Morning:
Having an issue with my Hp Pavilion Elite HPE-541F and Monitor HP2311x
Yesterday, thinking I was updating Java ... clicked on it and agreed to things being allowed on computer ... started adding icons to my desktop .... then pop ups kept coming up to register etc ... I assumed that something was wrong so I attempted to restore system to previous ... since then my system will not boot up ... will say "starting windows" and I can hear the fans working but thats it ... second part of the issue is that the monitor keeps going to sleep, so even if I try to restart the computer in "safe" mode or anything else monitor goes to sleep and there's nothing on the screen so don't know if anything is doing anything .... Very sorry I'm also not very tech savy with computers ... just trying to save time and money before I have to bring system to computer repair person .... Any help would be appreciated .... Thanks so very much

I am sorry, but to get your issue more exposure, I would suggest posting it in the commercial forums, since this is a commercial product. You can do this at
http://h30499.www3.hp.com/t5/Business-PCs-Compaq-Elite-Pro/bd-p/bsc-271
and for the monitor:
http://h30499.www3.hp.com/t5/Monitors-Experts-Online-Now/bd-p/bsc-1255
I hope this helps!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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2. Wake up from sleep
3. After step 2, macbook keeps going to sleep per 5 to 20 seconds
4. After restart, back to normal
1 > 2 > 3 > 4 > 1 > 2 > 3 > 4 >...

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