Lion Solved iMac Crashing -- I think it might have been samba!

In case this ends up being useful to anyone else, I just thought I'd share this experience...
I bought an iMac last summer (2010) to use at work (after a long battle to get permission to do so -- my employer is a Windows-only place).
I had a strange problem where the iMac would freeze up after being left on for 2-3 days straight.
I went through multiple rounds with AppleCare reps, all of whom were incredibly patient and valiant in their efforts to help be debug the problem. We checked to see if there was bad RAM, we did a clean install of the OS, etc, but nothing we could think of would solve the problem or seemed to be the source of the problem. And given that it took several days for the crash to take place, it was really hard to troubleshoot (and also really looked like bad RAM -- one rep was sure that's what it was, and I can't blame him). I was frankly blown away by how persistent and patient the AppleCare folks were.
Throughout this process, I had a sneaking suspicion that the culprit somehow involved Active Directory, or DFS, or something along those lines (that is -- my connection to my employer's Windows-based network).
After installing Lion, I'm inclined to think that's exactly what it was. Since installing Lion I have had no crashes, and the Windows network folders are much more stable and faster.
Yay Lion!
And even though AppleCare couldn't solve the problem (really, there's no way they could have), I still say yay AppleCare for their awesome efforts!

With Firmware updates, Apple will usually offer instructions to complete the update, since they require an additional step to complete. It sounds like you haven't finished the Firmware update completely.
Since it's your computer and investment, I wouldn't risk it and would visit your local Apple Store and let them solve the problem. In the meantime, read this link from Apple:
http://support.apple.com/kb/HT1557?viewlocale=en_US&locale=en_US
...to bring you up to date on the procedure.

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