A2000 mystery problem

[orb85750]

I can't figure this one out, but maybe someone else has had a similar problem in the past?  I have an A2000 with OS2, two floppies, HDD on a GVP SCSI card, and separate memory card.  The floppy drives are not recognized.  No problems booting from the HDD **until now** after I fiddled with the machine a bit.  I put the memory card and SCSI card in different slots, then the machine wouldn't boot up at all.  I put them back in the original slots and still no booting (but there is power to HDD).  I checked all connections and they are secure.  If I take the SCSI card out, I never even get to the screen asking to insert the OS2 floppy disk.  Does the system need to detect a floppy drive presence in order to get to this screen?  Anyone with any clue about what the hell might be going on?

[orb85750]

Thanks guys.  I'll try reseating chips and replacing the power supply.  (I have a couple of spares from partially dismantled A2000s.)  I also agree with the comment about Franco's MJ Avatar. :-)

[orb85750]

You didn't say it, but, the first thing I thought of was did you pull the cable off your floppy drives without marking and matching the drive to the connector.  Did you remove the drives from their mounting plate?

IIRC, the drives are jumpered to match their location on the ribbon cable.

Thanks for your help.  Actually, the problems started without me even touching the floppies.  They never worked correctly in this unit, and I've never gotten a click from either of them.  (Needless to say, I'm not the first owner of this A2000.)