Why is my iMac randomly shutting down?
imac early 2009 os x 10.7.5 previous shutdown -128
I've done SMC reset several times. Checked temp. Problem is intermittent which is to say, I can't create the conditions for it to shutdown. Always get the same message Previous Shutdown -128. Can't find any code list; so I don't know what -128 means. What could be wrong?
Is this a good question?