Power Light Flickers - suddenly!

I'm using a G4 with the widescreen flat screen monitor by Apple. A couple of hours ago, the Power light (the one on the monitor that I use to turn on the G4) started to clicker, and the screen illumination seemed to drop a bit.

Now the power symbol seems to flicker every 2-3 seconds.

Has something gone wrong? I don't think I kicked anything out of its socket, but one of the ubiquitous power supplies may have died.

Any help? Please?

H.