New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

 
Start a Discussion
 

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Switcher Hangout The place for switchers to discuss their new machines, and how to work with OS X. General support can be had here for newbie stuff, like "How do I restart my new iMac?" :)

IMac Randomly Shutting Down


Post Reply New Thread Subscribe

 
Thread Tools
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline


Three different times now, my imac has shut down for no reason. The first time was back in august. I took it to the genius bar, about an hour away. They ran a scan, and could not find anything wrong.

The guy said they have an auto shut off if there is a surge and after about an hour or so, they will power back up.


Mid November, i came home and it had shut down while my wife was on it. it had been down for a couple of hours and powered back up.

As i type this, it's down once again. It's been down a Hour and a half. I am on my son's Christmas PC!


Has anyone ever had this problem? Ever hear of it?

Is there some type of systems test i can run on it when it finally powers back up?

I bought it this past January - just about a year old.

thanks!
QUOTE Thanks
chscag

 
chscag's Avatar
 
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,497
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

chscag is offline
Mac computers are designed to shut down if they overheat. This is of course to prevent damage to the CPU and other components. I don't know if that's what your iMac is doing as there are other things that can cause a shutdown. Power supply, or bad memory for example.

Before doing anything else... if your iMac is still under warranty or if you have apple care, take it on back to the genius bar and have them go over it again. Since it's so close to Xmas, it may be difficult to get an appointment right away.

In the meantime, you might want to monitor the temperatures inside your iMac and the rotational speed of the fans. You can download istat menus from here or smcFanControl from here.

Also, check your system logs when the shutdown occurs to see if there is anything that stands out.
QUOTE Thanks
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline
Thanks for the repy -

I don't think it's the power supply. I use surge protectors. I know that isn't the end all of protection, but it's a good start. Nothing else that has been plugged into the same protector has failed, or even wavered.

I have plugged it into one of it's own for now.

Never thought about it overheating..i have been on it all day. It doesn't explain the other times, but you could be on to something.

Thanks for the links.

I hate extended warranties, and never but them, but 2 days ago i bought one for the computer through my credit card company. It was cheaper and longer lasting coverage than offered by apple.

The apple guy tried to sell it to me when i went down. It has been in the back of my mind ever since. As it was coming up on a year and it had shut down twice i bit the bullet.

I hate the fact that the bar is an hour away, but that is how it goes. It would be after Christmas for sure before i could get it in.

thanks again - if anyone else has any suggestions, i'm open
QUOTE Thanks
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline
It's worse than thought.

It never restarted last night, and will not boot up this morning. Is there any way to get it started besides the button on the back?
QUOTE Thanks
chscag

 
chscag's Avatar
 
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,497
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

chscag is offline
When you say it "never restarted", are you getting anything at all on the screen? Can you hear the fans spinning? Or is the machine completely dead - no power whatsoever?

If it's completely dead - no power - that's indicative of a bad or failed power supply. Which may be the reason for the random shut downs you were experiencing.
QUOTE Thanks
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline
Quote:
Originally Posted by chscag View Post
When you say it "never restarted", are you getting anything at all on the screen? Can you hear the fans spinning? Or is the machine completely dead - no power whatsoever?

If it's completely dead - no power - that's indicative of a bad or failed power supply. Which may be the reason for the random shut downs you were experiencing.
no power at all - no fan, nothing on screen.


when you are talking about ther "power supply" you are talking about where the computer is plugged in, correct?

nothing else coming out of the outlet has failed. i just now tried a different outlet, the fan kicked on for about 2 seconds, then went down. nothing ever came up on the screen.


it's obvious it's the computer - it's been almost 24 hours, the fan coming on a minute ago was the first sign of life.
QUOTE Thanks
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline
some good news - i just called the apple store. they take appointments early. my wife has some minor surgery monday. they can get me in before her surgery.

i'm almost hoping it doesn't fire back up - at least they can see what the problem is.

the other good news - it will be in under apple's warranty, that goes out jan 5!

i'm glad i got the extended now. i am hoping they can find what is wrong, but if not i'm covered for 4 years.
QUOTE Thanks
chscag

 
chscag's Avatar
 
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 38,497
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, OS X Mavericks

chscag is offline
Thanks for posting back. Let us know how it goes with Apple and have a Merry Christmas.
QUOTE Thanks
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline
Quote:
Originally Posted by chscag View Post
Thanks for posting back. Let us know how it goes with Apple and have a Merry Christmas.

merry christmas to you also!

thanks for trying to help, i really appreciate it. i'll keep you guys updated.
QUOTE Thanks
robotboy175

 
Member Since: Jan 10, 2010
Posts: 40
robotboy175 is on a distinguished road

robotboy175 is offline


got it back today - i just plugged it in - up and running. the power supply went bad.

in monday, out thursday.

i am a happy snob again
QUOTE Thanks

Post Reply New Thread Subscribe


« A year later...I'm regretting choosing Mac over PC... | New to Mac »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are Off
Forum Jump

Similar Threads
Thread
Thread Starter
Forum
Replies
Last Post
iMac keeps shutting down Wondercat OS X - Operating System 3 07-29-2010 08:59 AM
Imac G5 keeps shutting down Jennywren OS X - Operating System 11 07-08-2010 11:11 AM
Upgrading ram on Snow Leopard iMac Intel Rigged Apple Desktops 1 06-24-2010 01:44 PM
iMac can't browse MacBook Pro on the network LarryMcJ OS X - Operating System 2 06-28-2009 01:10 AM
Imac first impressions -- whoa! asolo Switcher Hangout 13 07-11-2006 01:29 PM

All times are GMT -4. The time now is 07:52 AM.

Powered by vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
X

Welcome to Mac-Forums.com

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!


(4 digit year)

Already a member?