I went ahead and bought a used motherboard (MB) for my laptop.
Just finished installing
and turning on laptop. Seems to work fine.
I'm confident as I even ran laptop on A/C alone with no battery and laptop posted and booted fine. Never got that far when things weren't working.
I'll let the laptop sit overnight then turn on again in the morning.
If works then , will conclude fixed!
Cost of used MB from ebay $32.95.
Had I gone the send in to repair route, would've been around $200 for parts and labor.
Guess the old axiom does hold true sometimes ... when in doubt, change the MB
.