A3000 Floppy Disk drive not booting

[Ral-Clan]

open the drive up and grease the rails.  It's probably sat there too long and needs to get unstuck - happened to me with an A3000.  You can also clean the drive heads when you are it.

You might want to very gently slide the drive head on the rails when you have it opened up in order to get it unstuck.

[Ral-Clan]

although i have not tried that (fix the drive) i have tried 5 other drive 2 357, 2 354 and a teach which work on other systems and still no boot up. I have tried swapping the CIA's but no good.
If you put a disk in the Amiga recognized that a new disk has been put in but about a quick read of the disk it does nothing.

Have you tried a new ribbon cable?