I have this exact same problem right now, two times over!
Both my original PSX adapter and the replacement adapter which just arrived yesterday are both DOA. Very frustrating seeing as how the replacement took almost three weeks to arrive.
Same results with mine. Lights flash on for a split second, and then nothing, no input response. Tried it with two different keyboards, one of which I know works, because I'm typing this message with it now.
VERY frustrating. Don't these things get tested before they leave the facility? I mean, two bad ones in a row? Common!! -_-
- Dan