I've recapped the (1.8A) power supply and the video board, and I've tried adjusting the voltage on the power supply. No matter what the voltage adjustment is set to, all I get is a whirring/buzzing noise from the power supply when I press the power button.
Pin 9 of the COP421 shows 5.34V (no matter the adjustment), and I do get a signal on pin 12 of U7F when I press the power button. This is all with the drive cage removed.
I'm out of ideas for now. What other components should I try replacing or things should I check?
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