Apple IIe - trying to get drives to work

I am looking for a troubleshooting guide web site or similar resource. Or maybe someone here can help? In a nutshell, I turn on the Apple IIe and drive 1 spins and the drive light comes on, but does not read any bootable disks. On the display the screen reads: Apple ][ I have a number of boot disks so I don't think the disks are all bad. I have checked the cables and the drive card. I have swapped out the drive card with another that works. I have swapped cables and they seem OK. How do I diagnose the condition of this computer? Is there an internal diagnostic? (key combinations?) What's wrong typically when a disk drive spins but nothing happens? Playing around with key combinations I found that control+clear apple+filled apple+reset brings me to a prompt of some kind, but I do not know what I can do from this prompt. I have no manuals. I would be happy to send a set of digital pictures to anyone interested in helping. Please email comments to billdeg(a)degnanco.com - thanks!