I upgraded from my old power supply that was 500w to a Antec TP-750 that is 750w . My MB worked for a couple of minutes and then shuts off instantly. I powered it on again and it shuts off instantly 10 seconds after the boot screen. Can anybody tell me what is going on with the motherboard?
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You didn't tell us what motherboard you have.
Edit: Why did you have to upgrade the PSU?
I have an asus crosshair and that MB requires a minimum of 600w power supply. So I bought a higher wattage.
If it works fine with the old PSU, then I would presume that the new one is defective.