Cold boot issue?

I've an ASUS M4A79 Deluxe, 8 GB DDR2 1066 Kingston, Phenom II 4X 965 3900, AMD 6950 2GB, CORSAIR TX750W.
PC works very well and turn on correctly however when my PC is off more than 7 days when I try to turn it, it turn on for less than a second and then it turn off as I were switching it off from PSU. Strange thing is that at that moment enery is fluying as led indicators at mobo are on.
To turn PC normally I need to disconnect it from power (or swith PSU off) for some seconds and then all works as expected.
What type of failure is this?

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More about cold boot issue
  1. try another psu for test that will help to see if the psu is defect or another part on the system
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