Korg PA80_Screen text dissappears

[Allexynno]

Hi,

Last week i bought a PA80. Because the resources where a dissaster i decided to reinstall the OS. I managed to reinstall it, but when i tried to install the first disk of resources i realized that the enter buton doesn't work. I opened up the keyboard and cleaned the enter buton. After this when i press the power buton it says " Loading system" for 5 seconds, after that the all text on the screen is gone, but the screen is still light up. If i try to reinstall the os the same think happends. Have anyone experience this ?? Thanks.