I too have that spontaneous freeze in the middle of playback. I/O disk error/ I also still have problems with power. I bent connectors pins as instructed by AJ, I cleaned contact pins, I glued variable resister. Nothing works. my last alternative will be just solder the wires from power supply board to motherboard. Voltmeter reads 5.3 v. Screen still varies in intensity when turned on. I run this through a power conditioner/regulator. No service centers in Hawaii.. Bummer I can't even rely on this machine as a sound module or drum machine. I don't even use it anymore. I really want it to work cause I like the sounds and especially the drums.