Hardware help on vintage IBM 5110 disk drive

Heya all, I apologize if this is the wrong group for vintage hardware,
but I couldn't find a better one. If there is a better group for this
please point me in the right direction

I have an ancient IBM 5110 complete with disk drive, picture here :
http://sinoth.net/img/5110.jpg
The problem is I can't get the disk drive to work. I have some old
5.25" disks that probably work, and also bought some 'new' ones that
shouldn't be corrupt and I can't get the beast to read the floppies.

I wouldn't be surprised if the disk drive no longer works -- it's been
stored in my grandma's burning hot attic for who knows how long... I
was shocked to find out the computer still works.

Anyhow, if anyone thinks they can help me troubleshoot this ancient
disk drive, I can provide more detailed info on what I've done and
exactly what happens. Thanks!