Wonder if anyone has encountered this problem?

I upgraded my Powerbook 520c with a PowerPC daughtercard. Everything worked
perfectly. However I needed to go back to the old CPU to run an old app that
was incompatible with the PowerPC. Upon switching back to the 68k CPU, the
machine booted with a Sad Mac and the hard drive wouldn't spin up. Tried the
new CPU again, same thing. Disconnected everything and reconnected to make
sure all cables were in tight, but now, when I power-on, all I get is a
clicking sound from the hard drive - sounds like a rotary phone dial. No
fan, no power to screen, no beeps, nothing. When I push command, control,
alt and power at the same time, the clicking stops, though. This happens
with either CPU, and it doesn't matter if I have a boot floppy in the disk
drive. I left it charging all night and it still happened this morning.  I
have a new hard drive I could test, but I'm wondering if the system is
damaged in some way, if that could damage the new drive.

Any ideas welcome!

-ethan 

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