Is that a yo-yo adapter? Every one I've come across can and will fail within time. It's usually due to the crapy mains power cable burning out, or fraying on the DC connector of the unit. You're better off getting a third-party adapter or later square white adapter for these things.

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I've gone through 3 yo-yos, and one 3400 45w adapter. This time, I'm trying my luck with a 3rd-party adapter.

The Pismo never came with a power adapter, so my sis is using the 24w adapter from my Duo 280c until both 3rd party 45w adapters show up. Then the 24w adapter can return to its duties powering the PowerBook 3400c hosting the LaserWriter