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Hello, I own a casioctk-691 that was working fine but suddenly stopped working.When I press power button the LCD goes ON but on screen shows something like I press a lot of keys/buttons at the same time,some letters are half.Also none of the keyboard buttons and keybed keys working.No sound at all.It looks like cannot boot or load the firmware to continue.Also I cannot turn it off from power button and I have to unplug the ac/dc power plug..The 9v adaptor is fine and also I used another bench adaptor with the same results.With batteries same result also. I disassembled the keyboard.The power supply board is fine.All dc voltage/capacitors/diodes according the service manual are ok.The cpu board gets all the 5v,9v,3.3v power..I found only that 1 of 2 Vram ics getting very hot quicly.If Vram is faulty IC can this be the reason for no booting or Not?..I tried the factory reset but because buttons not working nothing happens..I sent message to CASIO for a spare pcb but with no luck..It is my favorite keyboard and I will be very glad if someone with knoledge can help me or any ideas? Sorry for my long message, Thanks, Dimitris. 😊