Ok, further but still very confused, I checked all connections that witchery said I should check between u20 and u1 on main board, none show continuity. Witchery also said I should check voltages on u20 which I will do next. I also checked all FBs and Ls in the areas of u20, u23. All had continuity. Not sure if continuity between u1 and u20 is good or bad? Witchery also mentioned u65 might be an issue as well as xtal. It didn't mention u23.

Board 2 ran and passed all memory checks, save one. u38. Witchery had me check a pin on that ram chip and it did have continuity with the corresponding pin on u1. Not sure what to try next. Board looks clean. I can't find any visible flaws with magnifying glass.

Just checked voltages on u20, ramdac chip. On main board. I am getting 5v on pins 9 and 61. No real voltage on pins 27, 41, 43, 50....
. hmm probably a bad u20?