MP 1,1-5,1 Up and running - cMP 3,1, but...

[DCBassman]

The only remaining niggle I have with the cMP is that the power light is on so long as power is available, even with the unit powered down.
Edit: can't find any reference, anywhere, to this behaviour. Very odd. Working fine otherwise.

As above, from Early Intel Macs thread.
I've tried numerous searches, but have drawn a blank on this. Previously-owned cMPs didn't do this.
Can anyone shed some light?
TIA.