As long as you got the flashing '?' inside a floppy disk icon, the Classic is or should be working. You got a Bong an you got video - that's 2 out of 3, which the third is booting.

I too suspect the drive. Disconnect the power from the drive when booting from a floppy.

Since it is a Classic you should be able to boot the ROM Disk by holding the Apple-Option-X-O keys when you turn it on. If the ROM Disk works, you have a near (95%) working Mac.

If you have no boot floppy, you can make one through the ROM Disk. Once you get the floppy working, try the hard drive and plug it in. With either floppy or ROM Disk Boot, see if a hard drive icon comes on. Maybe it was formatted or the system folder deleted. But if no Hard Drive icon comes up, suspect that it is a dead or corrupted drive.

The ROM Disk might have a disk fix utility. But it is only for System 6. If the hard drive had/has System 7, using this System 6 tool will scramble it good. Ever tried to unscramble an egg? Its not possible!

Note: If this is a Classic II, it does not have a ROM Disk. Only the Classic has this ROM Disk. System 6.0.8 is the system on it.