I use an eMac to manage Ferret Computers' data, and I have everything backed up. When I turned it on this morning, the screen was completely blank on the bottom half and the bottom half of the screen was on the top half of the screen. I am having trouble operating the eMac, and the external display won't work at all - it says "No Signal." Does anybody happen to have any idea how i can solve this? Note: the eMac runs OS X Tiger (10.4) and it hasn't been updated from the Internet.