My only "old" Mac, a Performa 200 (late model classic style Mac), no
longer boots. This machine used to work just fine but has developed a
gremlin after 4-5 years of storage.
When I turn it on the screen shows five (I think) vertical bars
alternating black and white with a seemingly random sprinkling of random
characters. The case has never been open as I don't know how to open it.
I would appreciate any suggestions as to a likely cause and how to
proceed. Do I need a special tool to open the case?