Very sorry to hear that, Mike. I came to the conclusion long ago that running one of these with the original power supply begs problems, most serious of which is not the PS itself, but the possibility to knock out the main board, of which there are apparently none anywhere. Maybe you will have luck. Pull the PS and send it to the boys in Ft. Worth as many of us did. The other thing to try is pulling and resetting various connectors as these are not gold contact machines. I brought one back by replacing the ribbon cable after I saw that it was on/off/on/off. I hope you will have some luck. When these babies run they sound great and with new PS, my 750 is fine except for a weekly need to reboot.
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