Just set up a refurbished Dell Optiplex GX280. I received the Alert! Previous Fan Failure message once. Please allow me a stupid question, because I'm not a computer tech... On the BIOS Event Log, there is the one entry for the CPU Fan "Out of Range" I can still hear the fan running, and I've restarted the computer a few times since and NOT got the message. So do I still have a fan problem?