Ok first this is not a Car computer. It was originally built for that, but I use it in my house. It's a shuttle SSG51 or something like that. Anyway, I have the hibernate setting at 2 hrs, and the monitor off at 20 min. When the monitor is off the computer won't hibernate. If I put both setting at like 1 hr or so then it goes into hibernation. I even tried putting the monitor off at 1 min and hibernate at 2 min to test and it worked like that. But if the monitor has been off for a while the comp will not hibernate. Any ideas?