> For 164lx, cpu fan runs after power up ... then nothing.  No beep, no
> signal on serial line.

How long did you wait?  My own alphas often take a long time to send
anything to their serial consoles (long compared to other
serial-console machines, that is).

Or does "no signal" mean that the transmit line is not driven at all?
In that case I agree something is wrong - though it could be something
as simple as a miswired serial cable; I know that one of my alphas uses
a different pinout for its serial cables from some of my other systems
using superficially similar serial cables.

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