With the AC adapter, there's a fast 'clicking' coming from the 
speaker, which is much slower when on battery power, right?

If you remove the HD and then refit it, does the computer then start OK?

This sounds like exactly the problem I had intermittently when my 
Wallstreet had its original 4Mb drive, and all the time with its new 
40Mb drive.

There's a magnet in the display at the right which operates a sensor 
in the body of the computer when the lid is down, so that the 
computer knows when the lid is closed and so goes into sleep mode. 
Imagine what would happen if the computer always thought it was in 
sleep mode - won't wake up from sleep, and wouldn't start up because 
the lid is closed. I guess that the magnet in the new HD isn't strong 
enough to make the sensor in the computer think the lid is closed, 
but it is strong enough to maintain that sensor state once the lid 
has been closed, even if the lid is now open.

The cure - tape a bit of thin steel to the right hand edge of the HD 
so that, when the drive is inserted back in the machine, the strip of 
steel is between the drive magnet and the sensor, so acting as a 
magnetic shield. I'm currently using a razor blade, which has worked 
fine now for about a month.

All the best

Karl

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