To make sure that the computer itself works, start by turning up the contrast. If that does not work, unplug the hard drive SCSI Cable. The Mac should show a floppy with a blinking question mark. If so, then the hard drive is the problem. If not, then the analog board for the CRT has failed or the Logic board has failed
I have a modded classic with a RaspberryPi inside with a LCD screen. I would love to have some help modding the RaspberryPi to make it look like it is running the old Mac OS.... Please PM me if you have any suggestions.
Did I spot fine horizontal bars on startup or was that the camera? Anyway... this page has a lot of great info and has helped me get a few Mac Classics running: Classic Mac Repair Resources
You don't need a boot floppy to boot a Mac Classic. If you have the Mac's keyboard, just turn it on and hold down Command-Option-X-O (the Command key is the one with the Apple). Every Mac Classic had a boot disk embedded in ROM, complete with System 6.0.3, as a sort of easter egg.
