Q: imac 2011 white screen reboot
After upgrading to Yosemite, I've gotten into a number of reboot issues.
It seems to start with the screen going white, then it gets stuck in a reboot cycle.
I've since booted in targeted mode and repaired the drive (that worked briefly).
I then re-installed Yosemite via network. This too rebooted after a short time (less than an hour). Repaired the drive in single user mode, rebooted. It then crashed with in a hour.
I booted with option-D and ran the long diagnostics 3 times and it was clean all 3 times.
This is driving me crazy.
I had gotten notice from Apple sometime ago about the hard drive, why didn't they also mention the graphics card.
I also noticed that my Radeon card might be in a recall, as the last 4 digits of my serial number is in
http://9to5mac.com/2013/08/16/apple-opens-graphics-card-replacement-program-for-some-mid-201 1-imacs/
Model Name: iMac
Model Identifier: iMac12,2
Processor Name: Intel Core i7
Processor Speed: 3.4 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 8 MB
Memory: 12 GB
Boot ROM Version: IM121.0047.B1F
SMC Version (system): 1.72f1
Serial Number (system): xxxxxxDHJW
iMac, OS X Yosemite (10.10.1), freeze, reboot, white screen
Posted on Jan 20, 2015 4:58 PM
