I have every visible screw off the back and end pieces, but something in the center of the bottom case won't give way...
Download Service Manual for PX-410R as PX-410R is the same model as PX-575r.
http://www.circuit-encyclopedia.com/listinfo-67-111.html
SOURCE: Casio Privia PX-800: When using the sustain
Check if the cble frm the pedal MIGHT be flexing or pulling on the keyboard case when you use it. Such movement COULD vibrate the power connector causing your problem.
Make sure you have the right power supply for the unit as one with too large a hole for the power pin would be intermittent like this.
SOURCE: is there a "Factory Reset"
Here is a link to the manual:http://ftp.casio.co.jp/pub/world_manual/emi/en/PX410R_e.pdf Page E-79 describes the procedure. Here is a link to their support page in case you don't have the CD that was bundeled with the keyboard:http://www.casio.com/support/
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