Originally Posted by
Crazy Buddhist
A. Not this one as it works when open.
B. Well it is not this one either or you would have the same problem open or closed so we can rule that out.
C. Could be this as others have suggested - that the IDE cable is getting shorted, the connectors are getting squeezed or the molex to the CD getting shorted when the box shuts.
This really makes me think you have to look at all the possibilities under answer C above. Something about that case closing is shorting/compromising the connectors.
For the reasons stated above. Only those or a chasis intrusion switch you have missed.
Crazy