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In reading other posts it looks like it initializes the machine from a system disk in the floppy drive. The drive light should come on a couple of times to indicate that the disk is being read.
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We have a H400 with a Maztrol M-32 probably about 20 years old. The machine is hooked up but has not been turned on for 2 years. 2 years ago the monitor would turn on and the cpu would boot and...