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First, you really don't want to reset the power manager as a form of shutting the machine down by force. Instead, use shift-cmd-power. Start the machine and hold down cmd-ctrl-p-r till you hear a 2nd chime to reset PMU. If this doesn't fix the issue let me know and we'll try some more...

Do you have a fluke/voltage meter you may borrow? If so, I can run you through verifying the power supply. Also after making sure the computer is getting the correct power on all pins we can take it down to the minimal configuration to see if something else is causing the issue. I am betting...