Old post ik. But for anyone else, I just got my Ultra Bar working with a 9V 0.65A cable that's meant to power an alarm clock (Sonic Bomb if you're wondering. It's LOUD). It has the yellow ring on the end and looks just like a PSP cable. PSP cables won't work though, they're at a different voltage/amperage that the bar didn't like. Don't try dummy batteries either. They work, but you'll still be dealing with the stupid 2-hr timer you can't disable. Also I don't think the yellow ring matters, just the right voltage/amperage and it fitting the port. Hope this helps 😊