Go Back   MacRumors Forums > Apple Hardware > Desktops > iMac

Thread Tools Search this Thread Display Modes
Old Feb 16, 2013, 08:20 AM   #1
macrumors newbie
Join Date: Sep 2010
2011 27 inch iMac Random shutdowns....!


Just looking for confirmation of my diagnosis for my iMac fault.
Basically, my iMac has started randomly shutting down completely, shortly after switching it on.
Just before it shuts down, the window pops up asking if I want to shut down, but it still shuts down no matter what option I choose.
I have noticed this doesn't happen if I turn the screen brightness right down, but if I start to crank up the brightness then it shuts down.
I'm fairly certain the power supply is failing, but wanted a second opinion before I bit the bullet and bought a new PSU.
The iMac is out of warranty and I have tried SMC and PRAM reset plus reinstall of OS (Mountain lion)
muvaphuka is offline   0 Reply With Quote

MacRumors Forums > Apple Hardware > Desktops > iMac

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
MBP random shutdowns BiggAW MacBook Pro 5 Apr 30, 2014 08:51 PM
Random slow shutdowns AeroZ MacBook Pro 5 Aug 9, 2013 03:11 PM
help wanted, MBP random shutdowns snowsuit Mac Basics and Help 0 Apr 3, 2013 04:35 PM
Random Shutdowns DJLC Mac OS X Server, Xserve, and Networking 3 Aug 31, 2012 06:35 PM
Late-2011 13-inch MacBook Pro shows a white screen an random times when using it georgeperez Mac Basics and Help 1 Jul 21, 2012 03:27 AM

Forum Jump

All times are GMT -5. The time now is 05:40 PM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2015, MacRumors.com, LLC