MacPro randomly shuts down after upgrading to GTX 660

So I've had the EVGA GTX 285 mac edition in my MacPro 3,1 for a while now and decided to upgrade to the EVGA GTX 660 because I wanted a card that would provide more power for my 3d work and allow more gaming potential when I'm not working. After the upgrade I have been experiencing random shut downs. At first I thought it was during heavy loads (from my 3d software) but yesterday a shut down occured when I was just typing up an email with hardly anything running in the background. I've tried to diagnose the problem but to no avail. I believe the power supply is enough because the older card uses 2 of the power ports inside the MacPro while this new card uses just one. It's not overheating because everything runs at around 30C - 50C (rarely spiking to 58C.) Anyone know what could be the cause? I am working on my Windows partition by the way.

How interesting...we've noticed the same thing on 3 different occasions as recently as this a.m.. My wife was online for school, and the screen suddenly went "almost" black. There was nothing to do but shut down and turn it back on.
In 3 years since we've had this iMac, and running on 10.4, we never had this problem, so we're also hoping the community out there has some input on this issue.
Thanks!

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Hi ,
Thank you for visiting the HP Forums! A great place where you can find solutions for your issues with help from the community!
I came across your post about the Notebook, and wanted to assist you! I have looked into your issue about your HP Pavilion 15 Notebook and issues with sleep or shut down after upgrade to Windows 10. Try using the Windows Update Troubleshooting tool to fix the problem. Here is a document that shows how to update drivers that are not working correctly with Windows 10. HP has been working closely with Microsoft on the development of Windows 10. I hope this helps. Thanks.

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Jumpy mouse and shut-downs on G4 mirror door when putting to sleep or just random shut down after install of new 2nd internal WD IDE 320 gig hard drive, OS 10.4.11, orig HD is WD 80, RAM = 2 gig. Help!

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Hi Ted,
At this point I think you should get Applejack...
At this point I think you should get Applejack...
http://www.macupdate.com/info.php/id/15667/applejack
Ignore the MacKeeper ad no matter what else you decide.
After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
Then let it do all 6 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 6 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
First reboot will be slower, sometimes 2 or 3 restarts will be required for full benefit... my guess is files relying upon other files relying upon other files! :-)
Disconnect the USB cable from any Uninterruptible Power Supply so the system doesn't shut down in the middle of the process.
Just sits there occupying very little space & never interfering, unless you need to invoke it in Single User Mode.
After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
Then let it do all 6 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 6 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
First reboot will be slower, sometimes 2 or 3 restarts will be required for full benefit... my guess is files relying upon other files relying upon other files! :-)
Disconnect the USB cable from any Uninterruptible Power Supply so the system doesn't shut down in the middle of the process.
Just sits there occupying very little space & never interfering, unless you need to invoke it in Single User Mode.

Macbook randomly shuts down after installing Mountain Lion.

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I'm really at a loss as to what's going on with this. Has anyone experienced something like this or have any suggestions as to how to fix this?

Hi ppl again :)
I found that screen is not disabled, it is only have a very low brightness. So I begin to wait because I saw that actually installer is still running. Finally, Mas OS was installed and after that I change brightness using keyboard (it didn't worked while installation). Now all is ok. I also tried to reboot and system loaded correctly.
I hope this will help. Unfortunatelly Apple support was unable to help me by a phone call.
Have a nice day!

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Hi...I tried upgrading an old iBook G3 700 MHz from OS X 10.3.3 to 10.3.9 (combo). Now it won't finish
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going briefly during this time.
I booted with the hardware diagnostics CD that came with the machine, and all tests passed OK
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Wanted to just try reinstalling from the Panther CD set that I have, but I've found that I can't
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Success! This is so bizarre...
I have two Mac laptops, the iBook 700 MHz that's having the problem, and a newer
PowerBook G4. A few days ago I wanted to recharge the iBook...I've been very diligent
up to this point to use the correct charger with each laptop, the one that each came
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I got lazy this last time...plugged the charger for the newer PowerBook into the
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Knowing that there's a PMU (Power Management Unit) in these machines and that it
has settable parameters, I thought, what the heck, plug the correct charger back into
the iBook, just to see what happens. Voila, it started up OK!!!
What the heck ?!?!
I'm pretty well versed in computers (work with Unix and Linux regularly, love the
Mac OS X command line!), just don't understand everything that goes on under the
hood with the Macs these days.
Just to get some final closure on this problem, can anyone explain why doing what
I did resolved the issue? I'd really like to learn from my mistakes.
Thanks to Rhonda and S.U. who responded so quickly for my plea for help!
- Bruce

My Macbook Pro (early 2011, 15") randomly shuts down after being turned on from sleep mode?

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austine38,
if you boot into Safe mode, and then immediately restart into normal mode, log in, and put it to sleep, does it still exhibit the same random shutdowns afterwards?

HT6114 Since I upgraded to Mavericks my system randomly shuts down after about 10 minutes

I upgraded to Mavericks a couple of days ago and now after about 10 to 15 minutes my entire system shuts down and restarts. I am very frustrated and hope that someone will be able to advise me how to fix this

Restart - computer spontaneously restarts
If nothing in that article helps, the next time the problem happens, note the date and time the problem occurred, then go to Applications/Utilities/Console and copy the log starting at the time of the crash. Paste the log in a reply. Please do not use a screen shot as they can be hard to read. If there are repeated runs of the same messages, please post only one run. Be selective about what you post and don’t post huge amounts. Make sure there is no personal data visible. Information learned from Linc Davis.

Why won't my G5 shut down after upgrading to OS 10.4?

Hey guys. I have a problem with upgrading my OS to 10.4.
I am running a Late 2004 Dual 2 GHz PowerPC G5 with two internal drives. About a month ago, I upgraded the OS to 10.4.3. It was great having spotlight, but the comptuer would refuse to shut itself down. Instead, it closes all the apps and windows, and gives me a spinning ball. After about 10 minutes, the hard-drives stop clicking, after which the fans kick on and stay on full blast until I manually unplug the comptuer. I have upgraded to 10.4.6, reset PRAM, reset SMU (PMU?), verified and repaired...
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Contributed by Fumiaki Kawashima a Level 4 here;
There are many reasons to become unable shutting down or restarting from Apple Menu. Some were explained by other posters.
Most importantly, loginwindow (the parent process is launchd.) close out the user session, continue to set the device permissions and user preferences to their defaults in a restart action, or the process power off the system in a shutdown action. However, the issue proves that somewhere in those routines cannot be performed.
Users authentication system seems to be intact because you can restart or shutdown from the login window. However, the admin account authenticated by the Tiger security systems could confuse somehow and affect loginwindow process for setting up the user environment. This may result in interfering with the process for the shutdown and restart mentioned above.
Test if you can shutdown from the keyboard-- Holding down controloptioncommand keys, and then press the eject key.
Check if the loginwindow plists are corrupted. To do this test, remove the followings to temporary folders on the desktop, and shutdown from the keyboard shortcut combination. Restart the computer to test the recurrence.
/Library/Preferences/com.apple.loginwindow.plist
/Users/HOME/Library/Preferences/com.apple.loginwindow.plist
Try disabling Login Items for third-party applications via the Accounts system preference, if any.
Verify whether any third-party kernel extensions (including device drivers) interfere with the loginwindow hooks process-- Start up with a Safe-mode, then test the Restart from Apple Menu to see whether it works. Also, boot into a Single-user mode, and test if "reboot" command is available from the BSD layer. The I/O Kit API for software developers provides a shutdown hook so that ".kext" troubleshooting may need to be considered. Besides, some bad programmed extension may not be unloaded automatically at a shutdown or restart.
If the computer is configured with Irish language Input method and/or third-party Irish keyboard, try disabling them to test.
A third-party application or custom script may interfere with the loginwindow hooks for the Shut Down or Restart. For example, if you install an application that prevents casually powering down a system, the Shut Down and Restart buttons may not work. Also, if you install a P2P file sharing application, try uninstalling it.
As last resorts, troubleshoot a bad RAM and consider "Erase and Install" solution.
OPTION:
Post a part of system.log that indicates events from "localhost kernel[0]: standard timeslicing quantum is 10000 us" to the next same line.
This may help to narrow down because restarting or shutting down the system process can initiate the procedure programmatically by sending an appropriate Apple event to Mac OS X Tiger's system process (loginwindow).
Likewise, check console.log whether any failures is reported.
Corrections:
Most importantly, the loginwindow (the parent process is launchd.) close out the user session, continue to set the device permissions and user preferences to their defaults in a restart action, or the process power off the system in a shutdown action.
However, the admin account authenticated by the Tiger security systems could confuse somehow and it may impact on the loginwindow process for setting up the user environment. This may result in interfering with the process for the shutdown and restart as mentioned above.
Addendum:
If you post a copy of system.log, consider to edit the Ethernet interface ID to a fake value.
API = Application Programming Interface
Cheers!
DALE

My Mac won't shut down after upgrading to Panther

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Now each time I want to shut down, I have to force shut down. Can anyone help?
800 MHz PowerPC G4 Mac OS X (10.3.9) 1.5 GB SDRAM

Hard shutdowns can cause disk damage. You are better off leaving your Mac on until the problem is sorted.
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-mj
[email protected]

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Mine was bought last week and delivered yesterday ( with 4.1 or something old android and bought at sony site , despite higher pricing than local shops ) , did update ( with PC compagnion ) to 4.3 version and indeed , the shutting down causes it to freeze .
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Not a solution, but something to try.
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 Cheers, Tom

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Hi all,
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Hi beekatt,
Welcome to the Support Communities! The resource below will offer some suggestions if your battery is draining quickly. Have you tried shutting the computer down to see if you get different results?
OS X Yosemite: If your battery runs out of charge quickly
http://support.apple.com/kb/PH18599?viewlocale=en_US
If your battery on your portable Mac runs out of charge more quickly than you expected, check your battery’s condition.
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Service Battery: Your battery is not functioning normally, and you should have your Mac serviced.
Monitor your portable computer’s battery
If your battery won’t charge completely
If your battery’s status is Not Charging
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MacPro randomly shuts down after upgrading to GTX 660

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