I have Kubuntu installed on my desktop computer. Yesterday it crashed and rebooted. However, it couldn't get to the grub menu without rebooting again. This happened before and turned out to be a bad power supply. But this one is not even 2 years old, so I find it hard to believe that it's dead. This morning I powered on the computer again and it booted up just fine. Is there a log somewhere that I can look at to see if Linux reported anything before it crashed? Something that might help point the finger at the culprit?