II+ won't load any disks
I have some known good disks that will load fine on one of my II+'s, but won't load on the other with the exact same floppy drive and card. The drive just spins endlessly.
Since the disk subsystem isn't to blame, I'm wondering if this is some kind of RAM or power issue, or perhaps something else on the motherboard. I could go about replacing ICs one by one, but before I do that, I wanted to see if anyone knew of any immediate "things to check" for this particular issue - bad ICs known to cause this, etc.
I can at least get to a prompt, and normal Applesoft functions work fine.
Thanks for any help you can provide.