Why can't I open my own post?

odd.  hopefully nothing serious. :)

Yeah, I noticed the issue with your earlier post. I think the forum broke, when I posted my reply... Seems to be a bug in the forum software. I already contacted and told Tom, what in my reply may have triggered it. Though, of course, a forum shouldn't break when someone posts a message... (But I'm not going to reveal how to break the forum here, since we don't want more fried Fritter threads... :) ).

Conerning your original question:

The Apple II has no way of even knowing if the drive door was open or closed. So, normally this cannot even influence anything - unless the Apple II was already accessing the drive.

Your issue sounds like you have a problem with a loose contact or failed insulation inside the drive. The wires to the drive LED and those to the read/write head can get jammed - and their insulation may have worn off. You may be creating a short every time you open the door.

Check the wires to the LED and to the drive head. Also make sure the top drive assembly does not touch the analog board above, when it is in the upper position. The top spindle does not have much clearance to the analog board when in the open position. The metal axle must not make contact with the PCB:

DiskII_Upper_Assembly.jpg

Otherwise check for broken solder pads on the analog board. Something on the PCB which is sensitive to movement (looses contact when you open the door).