Hello everyone My PB froze twice in the last 24h. The first time the screen just went black and it didn't respond to anything. I had to restart using the ctrl-apple restart-button. When it booted up again, the system time was set to 1969 or something like that and it wouldn't connect to the interneet anymore. I had to restart it again to get it to work again. Then everything worked just fine until now. A few minutes ago, it just froze again, this time the screen did not go black. But I had to ctrl-apple restart again. No problems with the system time though. Both times I was not doing anything extreme, I think the only open programs were Safari and iTunes. Any ideas?? Thanks, Tom edit: I did not add any RAM recently. I had my harddrive replaced by an autorized dealer 2 weeks ago. But there were no problems until today.