I would be thinking of returning this unit asap. I had exactly the same issue with my TM-7102 - returned for a new PSU but on re-install it did the same thing again.
I sent it back and they replaced the motherboard.
There is a sfe boot routine you can try - if you need help with it drop me a note and I will dig out the key combo - think it is power off - then menu key and the key in the middle of the blue light , then power on and hold the keys down until it boots - if it doesnt then a new m/board may be needed.