How do I reformat a mac classic that gives me a sad mac with the letters SSSSSSF/SSSSSS2 commands under the sad mac. I had tried to put sys 7.5.1 on, and it took it origanally, then I decided to reinstall, and it wouldn't reformat, not accept any disk tools disk. I tried the Zip disk with 7.5.5 onit, the floppy, and nothing. Zap pram, no go, restart with extensions off, nada, and all of my bags of tricks. I guess that something is in the HD, so I think that I will have to take it apart and check the connections.
I upped the memory to 4 mb, for the slot had 2 openings, changed the jumpers to "simms in" (had a shop do it, no tool to open that toaster). it worked fine, but I wanted more, but no I just want to get it back, install 7.1 on it, and be done, what do I do?