My iMac crashes too...
So, at first, I thought my iMac is perfect, no dead pixel, no freeze (at least the first 12 hours of continuously using it.) However, today, it freezes twice. First time I was listening to music using iTune and browse the web using Firefox. The second time I was watching videos on YouTube using Firefox. They all crash the same way, suddenly everything freezes and the speaker will be repeating the last sound it plays.
New to mac so I am not quite sure, will OS X generate any crash logs which we can see what's causing it? I found DirectoryService.error.log under Logs, but it only shows "Improper shutdown detected." Judging by the time, it's generated "after" the crash happened. The info doesn't help much. I read somewhere that there's an application called Crash Reporter, but search using Spotlight only returns CrashReporterPrefs, not the actually app. 🙁
I don't get how come Mac users always have the confidence to claim Apple makes computer that just works. Based on the this thread, the iMacs we have are far from stable. Although everything else is fine, random crash without any obvious cause is just annoying as hell.