Interesting. It sounds like classic bad RAM or overheat. Have you tried throttling the CPUs?
The high pitch whine may or may not be normal with the battery disconnected. I wonder if you had a shorted battery which damaged the power circuit. You may need to get both a main board and a battery. (There was a thread here recently about buying batteries).
I wonder if @tllim has a word on a replacement main board.
The high pitch whine may or may not be normal with the battery disconnected. I wonder if you had a shorted battery which damaged the power circuit. You may need to get both a main board and a battery. (There was a thread here recently about buying batteries).
I wonder if @tllim has a word on a replacement main board.
:wq