My Casio Privia PX-350 won't turn on. I plugged it into the outlet with the AC adaptor but pressing the power button doesn't do anything. It's like the keyboard is not even plugged in. I tried on different outlets, I tested the outlets with different electric device, so the problem isn't my outlet. I tried holding the power button for some time, but it doesn't do anything.

SOURCE: I have a Casio Privia PX-320. The left side keys

Check that the front of the keys is not hitting the lower plastic case front. If they hit it, then you need to disassemble the case partly and see what has shifted. It is ALSO possible that something has caaaused the aftertouch sensor to move out of position and it is hitting the keys early. ANY of these conditions needs to be addressed before damage is done.

SOURCE: Casio Privia PX-120 cannot be connected to Reason or FL

When you are using midi the sounds from your keyboard aren't sent anywhere. What happens is control messages are sent over the midi cable from midi out to midi in on the other device which must have midi sounds on it (in your case the sound card) to make any sounds. The messages can be things like note on/of or pitch bend etc. If you want to send messages to produce a result on your laptop and still here something you can loop the messages by running from midi out on the device end ( your laptop) back to midi in on your keyboard. A much better explanation is available here:http://www.indiana.edu/~emusic/etext/MIDI/chapter3_MIDI.shtml I also signed up to this site (its free) that has great people and lots of info:http://www.recordingreview.com/ I recommend downloading Killer Home Recording setting up which at this time is also free and has the best advice you could want in it. I'd also recommend checking out Reaper which is comparable to Reason, Cubase or Protools. If this helps please let me know.

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: 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: Hi there, When I am trying

First thing is to get a meter and verify that the power adapter is producing voltage that it is supposed to. You can get inexpensive meters at Harbor Freight for example. I am not sure what you mean by "several outlets"... I HOPE that is not several on the Privia because there is ONLY ONE correct place to put the adapter cord into the Privia.
If you mean wall outlets, verify them by plugging in a known good lamp or appliance to check the receptacle is good.