Hello my name is Ludwing Sanabria, I live in Bucaramanga - Colombia. I write because I have a serious problem with my keyboard KORG PA 800, I bought 3 years ago and he has presented serious problems. I am a professional pianist and I know how to handle it, but we can't find the damage, the autorized technician has not been identified. The keyboard was functional and suddenly get stuck, the buttons do not obey, sometimes when I turn on the screen is only blue and doesn't load the operating system. Sometimes when I'm playing begins to sound very annoying background noise and distortion, until the keyboard is silent and stops working. Functions is only a monophonic speaker. The technician told me I had to change the main board, so I bought it in parts is parts Korg dealer when it came the thecnician changed and the keyboard worked perfectly, but it was only for half an hour and returned to crash.Later I on the keyboard and I read an error message whit the SSD, I did the reset process indicating the korg website and later install the operating system with the musical resources, and the keyboard worked only 10 minutes but with a background noise and blocked again. Please let me know if this keyboard I can do to the TEST PROGRAM to identify the problem. I appreciate if you can help me urgent. please excuse my english, -I speak spanish... the blocks began when once there was an increase of voltage in a place where I was playing my keyboard, I guess this has to do but not we locate the damage