For the last few months or so, I've been having issues with my Mac 128k. For a while, when the system was powered on nothing was displayed on the screen. When a floppy was inserted, you could here the machine booting.

Today I turned it on, and to my surprise the screen worked- booted up and everything. I come back to it an hour later and the only thing I see on the screen is a white line in the middle. When a disk is inserted the computer still chimes and boots. Can I assume the problem is a dead analog board?

Can I take a mac Plus analog board and put it in there?