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With the motherboard switches of the second 5150 set for MDA, if you remove the MDA card then power on the 5150, you should hear a series of beeps (1 long, 2 short) from the speaker.
That is the motherboard POST indicating that it cannot find an MDA card to initialise.
Do you hear that ?
Do you know if your stepdown transformer connects though the ground connection ?
I was just curious, because the only scenario that I can come up with that might explain the symptom is:
* Step-down transformer isolates ground; and
* Loss of ground in the 5151's video cable (or where it connects to within the 5151).
Seems unlikely, because in the 5151's video cable, two wires/pins carry the ground connection.
Wouldn't it have been easier to use a step-down transformer?
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