MacPro's power light remains on after Screen and drives shut down... why?

Hi,
I have a three year old MacPro which has been lightly used. Yeasterday it did something I had never seen before. I had the machine shut down, the screen turned off as usual, the drives could be heard turning off.. all was quiet... but tyhe front power light remained off... until I pressed the power button again.
Has anyone else had this happen?

I just had this happen twice to me. Did you solve the problem? If so, what did you do?

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