Corsair tx650 v2 on HP H8-1234 not working

I upgraded my PSU on my HP H8-1234 with a Corsair TX650 V2. When I press the power button, the fans turn On for a second then everything shuts down. This happens as I fully press the Power button down then again as I let go of the button. Bottom line is that my desktop does not Power On when using the Corsait TX650. This is the third unit of the same model that I have tried and all did the same thing. I then used a Thermaltake 600 PSU and it worked just fine. I don't think its the TX650 that has a problem but it seems that there is an incompatibility between my H8-1234 and the TX650. Any advise? I really prefer to use the TX650 over the Thermaltake.