If you have a Acer Aspire one net book, and suffer the black screen of death. the simple fix, is to reinstall the BIOS by USB port. takes 3 minutes.
Hmm...The only 2 times I've had to pull the battery to get the thing to shut down is when it locks up due to the DeLorme Topo US 8.0 trying to track via GPS. Locks up every time, some times sooner than other times, some occurences more fatal than others, but that's for another post (which I'm researching now)...