KORG O1WFD Boot Hangs up

Keyboard will only go to splash screen. The ROM is #62 and was just replaced making no difference
All caps were checked on Main board with only two needing replacement.
The PSU has correct voltages and caps are good.
The unit will not go to other menus.
I can not reset the KORG 01W…

I am wondering if there is a good way to test the RAM on the main board.

Any thoughts would be appreciated.