HP Media Center m1000 steady blinking light when plugged in

Sounds like a fault with the battery to me.

Have you tried removing the battery completely, and then running it off of the mains lead only?

EDIT: I see google lists this as a PC, so the above doesn't apply.

Usually on a PC the blinking light is an indication that the computer is in sleep mode. If it won't power up, try removing the power cable, and then hit the power button (to discharge electrics) and then reconnect, and try powering it up then.
 
I unplugged the power supply from the mb and the light stayed steady, but as soon as it's plugged back in.............blinking again
 
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