Register FAQ / Rules Forum Spy Search Today's Posts Mark Forums Read
Go Back   MacRumors Forums > Apple Hardware > Desktops > iMac

Reply
 
Thread Tools Search this Thread Display Modes
Old Apr 20, 2011, 08:20 PM   #1
jpfisher
macrumors regular
 
Join Date: Dec 2006
Location: New Jersey
27" iMac won't boot after power outage

Just had a breaker trip and I was unable to start my iMac afterward the power came back -- I had the same exact issue a few weeks ago after an outage -- in a different apartment (so it's probably not the electric from the outlet at fault)

Hitting the power button causes the drive to spin up and fans to go on, but no chime and no screen.

Resetting the SMC does nothing. Same results.

However, I was able to remove two of the four SO-DIMM modules (the two on the right side) and the system booted. I powered it down and put the RAM back in and it booted fine.

Any ideas? Logic board? Did I just need to clear the RAM in order to get it to go? I've not experienced anything quite like this before.
jpfisher is offline   0 Reply With Quote
Old Apr 20, 2011, 08:54 PM   #2
RollTide
macrumors 6502
 
Join Date: Mar 2006
Location: Alabama
Has happened to me a couple of times. I unplugged it, hit the power button and then plugged it back in. Powered on like normal.

Sucks living at the end of a grid.
__________________
Peter: Fox has one of those new reality shows at eight, "Fast animals, slow children"
RollTide is offline   0 Reply With Quote
Old Apr 20, 2011, 11:19 PM   #3
rkaufmann87
macrumors 65816
 
Join Date: Dec 2009
Location: Folsom, CA
Do a SMC reset by:


SMC RESET

*Shut down the computer.
*Unplug the computer's power cord and all peripherals.
*Press and hold the power button for 5 seconds.
*Release the power button.
*Attach the computers power cable.
*Press the power button to turn on the computer.
__________________
27" iMac i5, 24 GB RAM; MBA 11.6" 1.4GHz 4GB RAM 128GB SSD; Multiple HP Printers; Lacie Quadra D2 external HDs; 4S iPhone; Nikon DLSR
rkaufmann87 is offline   0 Reply With Quote
Old Apr 21, 2011, 09:28 AM   #4
Bmaintz
macrumors member
 
Join Date: Aug 2010
Location: Austin, Texas
I am buying a 21.5 iMac on the refresh...
Run a APC power back up on my PC, we get a lot of bumps on the AC line but my PC never blinks, just keeps on going...

My new iMac will get plugged into the APC for sure...
Bob
Bmaintz is offline   1 Reply With Quote
Old Jun 13, 2011, 02:25 PM   #5
jpfisher
Thread Starter
macrumors regular
 
Join Date: Dec 2006
Location: New Jersey
If anyone runs into the same problem -- this was caused by a bad SO-DIMM. Apple replaced the memory over the weekend and it's working perfectly.
jpfisher is offline   1 Reply With Quote
Old Jul 17, 2013, 04:03 AM   #6
nighthawkess
macrumors newbie
 
Join Date: Jul 2013
Mac won't turn on after power outage

I had the same problem. No matter what I did. That being "holding the power button down, checking the breaker, unplugging and plugging it back in. Making sure there was in fact power to the plug itself, by plugging in a lamp. I found another post on the internet that said, "Unplug the mac from the back of it. Not from the plug in." Then reconnect the wire ...again at the back of the Mac. Worked great and turned on no problem. (I wonder if it's some sort of protection "thing"?" Hope this helps some folks who are experiencing the same thing!!
nighthawkess is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Desktops > iMac

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
thread Thread Starter Forum Replies Last Post
2010 iMac won't boot after kernel panic. zViiPeR iMac 1 Jul 22, 2011 07:47 PM
09 27" i7 iMac won't boot after installing additional 8GB RAM, it beeps... MythicFrost iMac 8 Aug 26, 2010 01:59 AM
G4 iMac won't boot after updates rockinrocker PowerPC Macs 0 Nov 26, 2008 06:34 PM
iMac won't boot after trying to run bootcamp, keyboard wont even function. tehshawn OS X 1 Aug 24, 2008 05:16 PM
G4 won't reboot after power outage bioalchemist Mac Basics and Help 7 Dec 28, 2005 12:19 PM


All times are GMT -5. The time now is 06:25 PM.

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

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC