Are you getting anything from the diagnostic lights?
Please post back and let me know if you need more help.
No, there are no other lights.
The AUX led is on, on the motherboard, and the powerlight is on amber/orange/yellow as soon as I plug in the power cord.
And I can press, or press+hold power button but nothing changes.
Well perhaps I am losing my mind. I just unplugged everything and moved the computer, replugged everything and now get nothing at all when power button is pressed or held.
Symptoms are pointing to a power supply problem.
Seems like the power supply has failed.
Its hard to say otherwise unless you test with a known good power supply.
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Thank you - since I don't have another similar machine, I will order a power supply and replace it - I'll post an update after that!