Ghostrider wrote in message ...

Just asking what might be obvious --- ATX-P4 power supply with auxiliary
4-pin 12 V power connector also plugged into its motherboard socket?

Yep.

On a related note... Just tried booting with different memory. No go.
Then I tried booting with the CPU removed (just to see if it would go
to the BIOS & at least show something on the darn screen). Still no
go.