Cinema Display Blackout 23"

Hi,

I have a Cinema Display Blackout on 23". I was using it the other day just fine and suddenly it went black. Tried re-booting, unplugging re-pluging etc and no joy, still all black.

I've read posts about the morse-code flash on the LED (short-long-short), but my Apple Cinema Display's LED is lit up constantly as if it is working fine. I'm a bit nervous about spending £120+ on a new 150W power supply if this isn't the problem. Can't seem to find any posts that match my problem.

Can anybody help out there??? Thanks in advance...