When i switch on my Korg PA800, the screen just show's blank. The screen light gets on but just blank blue. What could be the problem?

Hi, Provided your Korg works as normal, besides the display being blank and lit, I may have the answer. It sounds like the contacts connecting the display have somehow become dirty. This could have happened from something getting spilled on the display. To fix is easy enough if you have a little mechanical aptitude. unplug unit/take batteries out,and disassemble unit to gain access to the main circuit board where screen is located, the screen may be held in place with a tin casing either soldered to board or with prong set though the circuit board and twised on the reverse side to hold in place. After removing this there should be a little rubber strip between the screen and circuit board-this is the contact strip that you need to clean with rubbing alcohol. Clean the screen where the contact strip meets the screen. do the same on the circuit board, reassemble and you should be back in business. I hope this was useful, thanks for asking FixYa, and good luck, Prodzilla.