I got a freezing / crashing problem on my iMac. It comes in three variants:
1. At some random moment (that means regardless which apps are open, sometimes even just after starting up*) the screen goes black, as when going to sleep. If there is anything happening on the computer (i.e. a YouTube video playing, or music in iTunes), it will continue, only with the video turned off. Sometimes ( I don't know what it's related to) if I press the power button for a short while - as when I make the mac go to sleep - the screen "wakes up", and everything works well again. Sometimes this doesn't work and a shutdown-restart is required.
2. At some random moment the screen would freeze - without going black - and the computer wouldn't respond, the only solution being a shutdown -restart using the power button. When this appears is as I said, random, but lately this sort of malfunction happened to me when I was trying to open an app (Mail or Chrome) from the dock...
3. The same as in 2., but if I wait for a minute or so, the freeze ends and the computer goes back to normal.
When these things happen, I get no error message or log, like with kernel panics, so I guess this is not a panic thing...
I have an USB hub (detached it now, to see if it changes anything) and a Wacom Intuos 4 tablet attached to my computer. I found a thread on these forums regarding Intego VirusBarrier causing crashes, so I uninstalled it and removed it altogether - without any notable changes.
I tried resetting the PRAM - it semed to solve the problem for several days, but then it happened again.
I updated the system - via Software Update, first to 10.6.4, then 10.6.5 - the freezes seem to happen not as often as with 10.6.3, but they still happen.
I repaired the permissions - nothing changed...
Could anyone help me with this? These freezes are not only annoying, they also cause me to lose whatever work I was doing...
Thanks in advance,
* I have quite a lot of software on my mac, so I'm not sure which could be possibly causing trouble... The ones that are open most of the time - and also are opened at login (since some of these freezes happened to me right after logging in, one of these could be the culprit) are:
The Hit List
VMare Fusion Helper