I'm not the best with electronics. I have an Audio Alchemy DDE 1.1 that stopped working for no apparent reason after unhooking it to redo equipment rack. After plugging it back in, nothing.

How do I use a multi meter to tell if the power supply is even working or what went bad? It has a 1/8 headphone like pin connector that goes into the dac, a wall wart box with power cord to wall.

Also, is it easy enough to replace if it is dead with a power supply that is not made by AA?