Turn the Keyboard off the press and while holding down the [TONE] AND [FUNCTION] buttons power on the keyboard. Wait until all reset is done.
SOURCE: Casio Privia PX-130, 8 months old: fluttering sound
If I were to venture an educated guess I would vote for failing filter caps in the power supply.
The power is likely collapsing under load of the speakers but headphones take much less drive.
If this has an external wall-wart power supply, you might try a new one IF the output is found to be under the rated voltage.
Internal power supply components are beyond those individuals that are not adept at electronics.
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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