"Display sleep" not working

I have my energy saver set to have the display go to sleep after 1 min. I dont like the bright glare coming from the iMac when i am not using it.
It worked fine until last night.
One thing that i think may have changed it: i used an emulation software called SNES9x for playing games. I noticed that in order for the software to work it had to adjust the displays when I used it (i saw the blue screens come on for a second).
The displays look the same now that I am not using it though.
How do i get sleep display working again?
10.8.5 osx
2.7 intel
27" imac

Hello, elgraso.
Thank you for visiting Apple Support Communities.
Here are a couple articles that I would take a look at when experiencing this issue.
OS X Mountain Lion: If your Mac won’t go to or stay in sleep
http://support.apple.com/kb/PH11080
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/HT1776
Cheers,
Jason H.

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Note that you can use the getKeyText() method to get the 'name' of the key automatically.
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Computer sleep not working

I've got 3 Macs at home:
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1x MacBook Pro 2010
All running the latest OS.
On all of them, same problem:
Display sleep (as per system preference settings) works, but computer sleep does not. Seems to be a fairly recent problem on all of them, so I highly suspect a bug coming from a recent MacOS X update.
Tried everything I read about to fix the problem (deteled some pref files, created new account, stopped sharing, removed the internet, disconnected all peripherals...)
Are you having this problem as well?
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Well, there's this faq also....weird that it's happening to all three Macs. Do you have them networked together? Is there a USB device all three share?
This is for a Mac that won't sleep.
Here is Apple's KB article HT1776 with their tips.
Mine follow;
USB devices and hubs often cause Macs to not sleep or wake quickly from sleep (notably HP printers and scanners, HP all in ones, and Cannon scanners). Disconnect all USB except for keyboard and mouse and try. If it sleeps, add one back at a time testing after each one to find the culprit.
If you've set your Mac to receive faxes, it may not be able to sleep. It might also have a damaged preferences file.
If you use your Mac for faxing, open System Preferences. click Print & Fax, click the Faxing tab, and uncheck the Receive Faxes On This Computer box.
If that doesn't work or you've never faxed on your Mac, go to Finder/Hard Drive /Library/Preferences/SystemConfiguration and delete the com.apple.PowerManagement.plist and com..apple.AutoWake.plist files (if your Mac asks, type your admin. password).
If the latter file isn't present in the folder, go to user name(probably your name)/Library/Preferences, delete the com.apple.systemuiserver.plist file, and reboot your Mac.
Next are user tips……..
Check in System Preferences > Energy Saver is "Wake for network access" checked? If so, uncheck it.
One user reported, " I couldn't make my macbook pro to go to sleep because I had my wireless headphone receiver still plugged in. I unplugged it and then it went to sleep."
Also, if you have an External Western Digital (WD) hard drive and have installed
WDDMService and WDSmartWareD on your Mac, it may not sleep. Fix is to un-install those....you don't need them to use the drive.
"I have had this problem with my IMac G5. It is surprisingly irritating. LaCie's Silverkeeper backup software was the cause. By default it gave itself permission to wake up the computer to check if a backup was needed. Do you have this or a similar program installed which has scheduled activities including wake-up permissions as an option?"
One provided this link, xlr8yourmac.com, to a member, which addresses failure of deep sleep with some users that updated and added new FireWire and USB card.
Also, here is Apple KB article TA2469 about PCI cards and sleep.
After few days of messing around I found out that I had desktop background (wallpaper) set to change every 1 minute.
After unchecking "Change picture..." in system preferences (under Desktop/Screen saver), my powerbook went to sleep all by itself.
"I have a Canon printer(shared) and my imac would not sleep. I opened up printer/fax in system prefs and noticed it said the printer was in use when it was off. Opened up the printer queue and noticed about 7 pending documents. Deleted them all and now it sleeps.
Check the printer queue!"
One user has had success, after trying all these tips, using an App. called PleaseSleep. I've never used it though.
Good Luck!  DALE

17" LCD Cinema Display does not work on G4 Tower with ATI 9000

Hi,
I have a G4 Tower with the original AGP ATI Radeon 9000B video card. My friend gave me this unit just recently but not the original monitor. Well after he got his new 30" Cinema Display he gave me the original 17"LCD Cinema Display. I was so happy, plugged it into the card and fired up the CPU but nothing! just blank! It is not getting any power for the USB ports or anything. My buddy says the monitor was checked before I picked it up. I yanked the Video card out and put it back in, inside the CPU was clean as was the card, put it back together and still nothing. The VGA monitor I have is connected via adapter to the other input and works fine. I tried doing display settings and the Cinema is not even detected. Is the Video card fried on the digital side?
Do I need a new one?
Here is the info on the CPU:
Machine Model: Power Mac G4 (AGP graphics)
CPU Type: PowerPC G4 (2.9)
Number Of CPUs: 1
CPU Speed: 400 MHz
L2 Cache (per CPU): 1 MB
Memory: 1.5 GB
Bus Speed: 100 MHz
Boot ROM Version: 4.2.8f1
Serial Number: XB0120xxxxx
Any help wold be appreciated.

Hi MFG,
Welcome to the discussions.
The G4 AGP Graphics model originally shipped with an ATY Rage 128 graphics card. The ATI Radeon 9000 graphics card that is installed in your G4 is not the original card.
The ATI Radeon 9000 comes with a native ADC port (which you are trying to use). This port is only fully functional if the computer is ADC enabled. Your model of G4 is, unfortunately, not ADC enabled.
You can confirm this by opening the computer and having a look at the AGP slot (where the graphics card is installed). In ADC enabled Macs, there is an extra slot at one end of the AGP slot to accomodate an "extra leg" that the ADC graphics cards (such as the ATI 9000) have. This extra leg supplies the power and USB feed. You'll probably find this extra leg with no slot for it to go into.
What this means is that you are not getting power and USB feed through the ADC port to your display.
If you want to get the 17" ADC Apple LCD display working off this card (it's definitely the LCD display and not the CRT display, please confirm), you will need to use a DVI to ADC adaptor such as this one:
http://www.drbott.com/prod/db.lasso?code=0111-DVAD
and run it off the DVI output.
You can run your VGA screen at the same time (if you want to) off the ADC output by using this adaptor:
http://www.drbott.com/prod/db.lasso?code=0117-ADCV
This will work off the ADC port because, although the ADC port is not getting USB or power feed, it's still getting the DVI feed (which is what this adaptor needs).
Cheers!
Karl

Target Display Mode not working iMac 27(2012) Bootcamp to iMac 27(2013)

Hi All,
I recently purchased an iMac 27" 2013 which replaced my iMac 27" 2010.
===============
PREVIOUS SETUP
===============
(1) iMac 27" 2012 - Running Windows 8.1
(2) iMac 27" 2010 - Running OS X Mavericks
(1)+(2) were connected with a Mini-Display-Port cable.
(1) was using (2) as external display while (2) was set to Target Display Mode using CMD+F2
==============
CURRENT SETUP
==============
(1) iMac 27" 2013 - Running Windows 8.1
(2) iMac 27" 2012 - Running OS X Mavericks
(1)+(2) are connected with Thunderbolt cable.
(1) can't use (2) as external display anymore becuase CMD+F2 has no effect anymore on (2) in this scenario.
If (1) and (2) are both running OS X all works as expected.
I am aware about the support hint from Apple where they state TDM is not working under Bootcamp.
And I agree, while booted into Windows Bootcamp this machine can't serve as external display. Makes sense because TDM is baked into OS X display drivers.
Anyone had the same experience and came to a soltuion?
Thanks,
Martin

"Apple has no plans to implement a client driver for Windows since there is no Thunderbolt SW stack available for Windows like there is for Display Port."
That is a little bit funny since Gigabyte and other big companies have said that 2014 is the year that they are going to implement Thunderbolt in many motherboards.
"GIGABYTE 7 series motherboards are the very first to offer fully certified dual onboard Thunderbolt™ ports. Capable of connecting up to 12 devices plus 3 digital displays simultaneously with breathtaking data transfer speeds that can transfer 1TB of data in only five minutes, GIGABYTE Thunderbolt™ motherboards offer the fastest connection interface on the desktop PC."
Have you asked Apple about that? I dont understand why Apple is crippling Thunderbolt on their devices...

"Display sleep" not working

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