Q: 10.10.4 SPONTANEOUS REBOOTS
Um.. "this is not good"....
ever since 10.10.4, the machine will spontaneously reboot itself.
today, I had a spreadsheet open, and was typing away into a long email when "poof!" the machine flipped to a grey screen, eventually showing the folder with a question mark. Wasn't running hot at all... ( I thought maybe the last couple of reboots might have been due to overheating - its been very warm here) but in fact it was definitely not too warm today. Anyway, I've been watching hardware values, and it never gets hotter than 50 on any of the hottest heatsinks (general temp is 33-40, typically)
The last few crash reports have come back with "kernel panic" at the top, so It seems that probably relates to the OS.
Anyway, this only started IMMEDIATELY AFTER THE 10.10.4 update.
Is there a known 'quick fix'??? I am not averse to reformatting the whole system if need be... i have a 10.10.3 installer disk handy.
Mind you a clean install means a whole day wasted, but its preferable to having the machine crashing spontaneously...
ANY APPLE COMPANY REPRESENTATIVES ON THIS FORUM???
iMac, OS X Yosemite (10.10.3), 32 gigs of RAM, Quad-core i7
Posted on Jul 8, 2015 2:26 PM
Previous shutdown cause: -128
A negative shutdown code may indicate a hardware problem. The precise meaning of the codes is not publicly documented.
If you haven't already done so, you can try resetting the System Management Controller. Otherwise, or if the reset has no effect, see below.
Make a "Genius" appointment at an Apple Store, or go to another authorized service provider. You may have to leave the machine there for several days.
Back up all data on the internal drive(s) before you hand over your computer to anyone. There are ways to back up a computer that isn't fully functional—ask if you need guidance.
If privacy is a concern, erase the data partition(s) with the option to write zeros* (do this only if you have at least two complete, independent backups, and you know how to restore to an empty drive from any of them.) Don’t erase the recovery partition, if present.
Keeping your confidential data secure during hardware repair
Apple also recommends that you deauthorize a device in the iTunes Store before having it serviced.
*An SSD doesn't need to be zeroed.
Posted on Jul 9, 2015 11:58 AM



