Intermitantly my Mac Pro will just click and not start.

If I unplug it or press the on button and hold it it will come back. I noticed that when this happens two little red lights are blinking on the system-board a PT A and PT B . I can see them between the memory boards. Any ideas?

It was the power-supply supply. A bit concerning for a new Mac since it happened from new but I am very grateful I bought the maintenance agreement since they broke the door opening it and had to replace the cast. Thanks for all the wonderful help!

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