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sick 3640

I have a '40 that was just moved to a new lab, and now
won't boot. I can bring up the FEP, issue the boot instruction
and watch it go all the way through to the start instruction.
At that point things get wierd. The usual disk seek noise
is way too short, but if I wait (and wait) and then h-c-function
out I get a long wait with the message
"Waiting for lisp to stop itself...

If you then do show status you get
FEP Lbus control: Doorbel Int Enb, Use Corrected Data, Ignore Double ECC error
		Task 3 req
FEP Proc Control: Fep int enable
Seqn misc status: TSK-STOP

3600 program ctrs
all the pc's are 40002

Attempting to use the FEP debugger is a dismal failure:
you get
<error printing object: the arg given to the CAR inst, #<DTP-0 0>, was
not a list, locative, or nil>
Then you are totally lost.

I have switched the DP, XSQ (yeah, I suppose it's really '45), MC for an IFU,
all from another machine, switched the memory too, and still get the same symptoms,
though I did not do the status checks on all the combinations.

Any suggestions besides a merciful death? 
David Strip