Interesting problem.

Have an electric window that powers itself open when the ignition is turned on and won't go back up to close.
The only way to close it is to hold the key over in the lock and use the "comfort" feature.

As I didn't want to drive everywhere with an open window until I figured the problem out, I took out fuse #17 from under the bonnet which is marked Electric Windows. Its only a brown 7.5 amp fuse - small??

But without this fuse, there is no ignition and the engine won't start. ie: the dash doesn't spring to life with all the indicators and lamps etc, and there is no starter.

Put the fuse back in and everything returns to normal including the window opening itself again!

I can understand that the window problem might be the switch unit or wiring short or something, but whats with removing the fuse and losing the ignition circuit?
The only thing I can think of is that the fuse #17 is only 7.5 amps and so must be the electric window controller or something like that rather than the motor fuse (which I would expect to be around 25 - 30 amps). So maybe the GM or the DDE or something is refusing to allow the engine to start as it thinks the car is "unsafe".

Any ideas?