Roland MKS-20 gets stuck at booting

Hi -

I have an MKS-20 that gets stuck at booting. When I turn on the power, the Lcd display lights up only with a top row of boxes for letters, and all the front panel buttons light up and continuously blink/flicker - including the Midi Indicator.

Has anyone run into a similar issue?

Thanks in advance.

check power rails to see if in spec

Might try reseating the roms and any connector ribbons. Worth a quick try.