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The cable from the drive to the motherboard is the original.

I bought a 128k Mac. Disk drive conitnually spins, disk inserted or not. Swapped out disk drive for another known-good one, same thing is going on. I'm guessing it's something with the motherboard? Help!

Thanks for all of your help. I’m just wondering why it started screwing up right after I tried changing the ROMS….

So upon startup, I get tthe normal “bong”….then a disk with an X blinking on it appears. Meanwhile, the actual drive is spinning like crazy.

Still an X on the floppy disk. I have tested the movement on the indicated mechanism...there is a red "eye" that is active when the drive is on, and the arm seems to drop down to obscure it when I insert a disk...still, nothing.....

Thank you, that makes sense! I did look into the front of the drive, and found two mechanisms that actuate when a disk is put in….one on the left, one on the right - and they seem to trip something when that happens….both seem to work ok…which side is the one you are referring to?

Thank you for your reply. It just seemed odd to occur after I messed around with the motherboard....you have any advice, other than eBay, on where to get another drive?

I tried replacing the ROMS on my Mac 128k motherboard, because I couldn't get a system disk to boot - tried two different disk, one 'new'. They didn't seem to work, of course....put the old ones back in, and now the internal disk drive is spinning at full speed before I even put the floppy in...

Actually, it was just the forgotten about brightness control. Duh!

Been many years since I did repairs on Macs….let alone a 128k. So I got this 128k today, repaired the floppy drive (lubrication). The monitor is weird - see photo. Horizontal thin lines, seems to bright, the the picture is not “solid”, as if it bleeds out a bit from the center. Tried adjusting...