Nope, all the covers are on the PC (though no screws, there neither are any, nor anywhere to put them if there were).
The back up power supply, with the rats nest of cables coming from it, was on the floor behind the desk, I stood the tripod in the gap between the wall and the desk (the gap having been made some time ago by the sodding great 19" CRT monitor case - gap no longer required by 20" LCD screen). Thr tripod overbalanced, fell on top of the back up power supply, managed to land exactly on the main on/off switch and partially disconnected it - drawing out a very colourful electrical arc as it tried to decide if I wanted it on, or off.
It made the decision for me in the end and selected permanent off. Little knob departed company with the tripod at the same time, by the way.