Its frozen and cannot load

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try to re-initialize.

It is power supply regulator problem.
In the regulator circuit, DC 12volt from adapter is separated into +8V, -8V, +5VA, +5VD. Some causes when the unit hang /blank/ frozen is one of the existing supply voltage is drop. In general, +5V.
Also check the adapter voltage, if still normal and the current is sufficient.
Adapter must have DC12volt and current of at least 3 amperes.
It may happen, when the adapter is measured without load, it's read normal 12v, but when loaded to turn on the keyboard, many voltage decreases (lets say,between 8-10v).
This indicates that the adapter is not good and need to replace.

It is 3 years/5 years warranty depending on your country.
Call CASIO warranty or contact dealer.

Have you tried it with batteries? Are you sure the power supply is working correctly? It should not need the OS to operate as a keyboard disconnected from the computer.

The cable connection is just a MIDI cable that uses opto-isolators so the 2 items are electrically isolated from each other. The software driver for the Korg should load without problem. The Korg program itself may be looking for inputs that are not there when the keyboard is off and the program itself reaches a stop command.

If the PA80 will not work on just the power supply- the power supply can be the fault- it has an internal fuse. Finding a similar supply with the same coaxial plug wired the same polarity is the way to test it if the battery option is not available.

The unit has been put into the mode to reload the operating system. You need to connect it up and load it with fresh download of the system. You can probably download the firmware from the manufacturer's site in their support section. There may be no other way to restore it. Be careful as any corruption during a flash download can be fatal requiring return to the manufacturer for reloading. Find the firmware for your unit here:

http://www.dbxpro.com/Software.php

Follow the directions for instalation TO THE LETTER !!! Read twice before doing !!!!

Verify you are using the CORRECT power adapter. There are several model adapters, but yours should provide 12 volts at 2 amps.

This is likely a compatibility issue. Turn power off and remove the card and make sure the unit comes back to life.

SD card compatibility can be a problem.

You might want to go to VSPLANET.com as there is a lot of info on forums about recorders.