I'm experiencing random shutdowns on my 2.5 Quad. Temperatures are all perfectly fine. One shutdown happened simply browsing the web, another was under high load encoding video to my PS3 (PS3 Media Server). It's done it about 4 times now. The last one, the computer acted as if it was going into sleep mode, but wouldn't snap out of it. (Power LED lit, black screen, non responsive) I checked /var/logs/system.log and found nothing abnormal at all. When the computer shuts down, it doesn't log ANYTHING in there. Is that the correct log to be looking at? Also, if the computer isn't logging a reason for the shutdown, does that hint towards what the problem actually is? I'm considering replacing the CR2032 battery on the motherboard, if that sounds like it's a good idea. I haven't sold my old 2.0DP yet, which was reliable as dirt, and I don't know if I should. Maybe it's time to ditch the Quad before it gets worse? I love it to death because of its speed, but if its not going to be reliable, we can't stay together.