OS X 10.7.x, (updated to 10.7.2 when it became available last week); Quad Core iMac.
Hard crashing about every 2 or 3 weeks, except had one yesterday and another today, 5 times total so far. Mouse and keyboard go dead. Screen frozen. Doesn't respond to LAN ping. Dead.
Reboots fine. Nothing at all about the crashes in the console all-message log. No evident problems, operating normally.
Note: This machine has had no kernel panics at all in about a year, since I bought it, by the way.
My two suspects are
- Add-in-RAM -- maybe I should have bought the most expensive instead of moderate-priced 4GB modules , a few weeks before the first crash.
- Firefox 7.0.1, as that was the active app when the last 2 crashes occurred.
I'm keeping notes on the date, time, and front-most app when the crashes occur.
Any ideas? Any instrumentation to add? Tests to run? (Given the time between crashes, I doubt a memory diagnostic is going to find anything.)