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
Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

Mac mini restarts randomly and sometimes throws power-down error


Post Reply New Thread Subscribe

 
Thread Tools
sforscarlet

 
Member Since: Apr 29, 2011
Posts: 8
sforscarlet is on a distinguished road

sforscarlet is offline
I have a (2H) 2010 Mac Mini model that keeps restarting itself at random times.

The frequency of the restarts are probably 2-3 times a week. I'll return to my desk and am treated to the main login screen, where I have to login and all my programs have to be relaunched.

Occasionally, I even get a weird error message that overlays over the entire screen... "You need to restart your computer. Hold down the power button until it turns off, then press the power button again"



I thought this may have been a cooling problem, so I got a USB fan and have it cooling the CPU. Even now, after I restart I feel for heat and the mac mini is very cool, not hot.

The mac shows a problem report after restart...
You shut down the computer because of a problem.
"thread_invoke: preemption_level -1, possible cause: unlocking an unlocked mutex or spinlock"

Has anyone had this issue or have any suggestions?
QUOTE Thanks
dtravis7

 
dtravis7's Avatar
 
Member Since: Jan 04, 2005
Location: Modesto, Ca.
Posts: 27,838
dtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond repute
Mac Specs: iMac 2.4 C2D 10.10, iMac 2.16 C2d 10.6.8, Macbook2007 10.8.4, Mac Mini 10.8.4, iPhone 3GS Note 8!!

dtravis7 is offline
That is a Kernel Panic. One question, have you added any Memory (RAM) since you purchased it?
QUOTE Thanks
sforscarlet

 
Member Since: Apr 29, 2011
Posts: 8
sforscarlet is on a distinguished road

sforscarlet is offline
Yes, I've swapped out original RAM with two 4GB slabs, making it 8GB total.

I bought these...
Amazon.com: Crucial Technology CT51264BC1067 4 GB 204-pin SODIMM DDR3 PC3-8500 CL=7 Unbuffered NON-ECC DDR3-1066 1.5V 512Meg x 64 Memory: Electronics
QUOTE Thanks
Raz0rEdge

 
Raz0rEdge's Avatar
 
Member Since: Jul 17, 2009
Location: MA
Posts: 7,690
Raz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant future
Mac Specs: 27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 5 & 5S, iPod Nano 7th Gen, iPad 2 16GB WiFi, iPad 3

Raz0rEdge is offline
Since your crashes are frequent enough, replace the Crucial memory with the original memory that came with the Mac Mini and observe for a few days to see if it's stable. If it is, then Crucial memory you got is either the cause for the crash or you didn't seat it properly..

--
Regards
...Ashwin



Be sure to read the Community Guidelines | The more information you provide, the better answers you get, remember GIGO.
QUOTE Thanks
sforscarlet

 
Member Since: Apr 29, 2011
Posts: 8
sforscarlet is on a distinguished road

sforscarlet is offline
OK. Is it common for memory to be bad?

Is this typical of Crucial Memory? Should I look to get a replacement brand / type if this is the cause?
QUOTE Thanks
dtravis7

 
dtravis7's Avatar
 
Member Since: Jan 04, 2005
Location: Modesto, Ca.
Posts: 27,838
dtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond reputedtravis7 has a reputation beyond repute
Mac Specs: iMac 2.4 C2D 10.10, iMac 2.16 C2d 10.6.8, Macbook2007 10.8.4, Mac Mini 10.8.4, iPhone 3GS Note 8!!

dtravis7 is offline
Crucial is normally some of the best RAM out there. If the old ram solves the Panic, then you either got unlucky and got a bad stick or as Razor said, maybe one stick is not seated all the way.
QUOTE Thanks
Raz0rEdge

 
Raz0rEdge's Avatar
 
Member Since: Jul 17, 2009
Location: MA
Posts: 7,690
Raz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant futureRaz0rEdge has a brilliant future
Mac Specs: 27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 5 & 5S, iPod Nano 7th Gen, iPad 2 16GB WiFi, iPad 3

Raz0rEdge is offline
RAM chips are sensitive devices that need to be handled properly as far as ESD is concerned, the newer RAM chips are way more ressilient than the older ones, but it is still possible to cause damage. Name brand chips like Crucial are usually all tested before they leave the factory, so a fault with the manufacture process is not likely. Not seating the RAM properly however can potentially cause problems with a lack of proper ground and other things..

So run the quick test by going back to the original RAM ensuring that you are safe with it's handling (i.e., discharge yourself on a piece of metal before holding the RAM) and ensure that the stick is inserted fully and securely and let us know how you fare..

--
Regards
...Ashwin



Be sure to read the Community Guidelines | The more information you provide, the better answers you get, remember GIGO.
QUOTE Thanks
sforscarlet

 
Member Since: Apr 29, 2011
Posts: 8
sforscarlet is on a distinguished road

sforscarlet is offline
Well, reporting back (sorry it takes a while for the problem to manifest).

So here's what I now know...

1. I don't have the original memory anymore. So I just opened up the mac mini, and checked to see if the memory looked properly seated.

I did notice one of the plastic clamps on bottom memory was bent, and after trying to straighten it, it broke off. Here's a pic...



pointing to the bent plastic clip and metal surround. circled the plastic part that broke off.

2. I tried booting with just the bottom memory attached (the one with broken plastic clamp) and I eventually got same error after about 4 days.

I can try again with the other memory to be sure its bottom only. But I think it likely is the clamp is the issue vs. the memory.

Mac mini is less than 1 year old, will apple store support a warranty fix this?
QUOTE Thanks
EvenStranger

 
EvenStranger's Avatar
 
Member Since: Dec 09, 2010
Location: Virginia
Posts: 845
EvenStranger is just really niceEvenStranger is just really niceEvenStranger is just really niceEvenStranger is just really niceEvenStranger is just really nice
Mac Specs: Currently 13" Late 2010 MBA, 4GB/128GB; Early 2011 13" MBP, dual core i7 2.7ghz, 4gb ram, 500gb hd

EvenStranger is offline
Considering the RAM is user serviceable and the break occurred while installing RAM - when I was a technician, I would have covered it. Talk to a technician, let them know what happened, and ask if it can be covered. My guess is that it'll be no problem.
QUOTE Thanks

Post Reply New Thread Subscribe


« Imac stuck on login | Dual core mac Pro and drive compatibility »
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

All times are GMT -4. The time now is 11:59 PM.

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?