GA-Z77X-UD3H powers off after 1/10th of a second

[smithisize]

So I bought this brand new motherboard and I put it on some cardboard, plugged my my 450W power supply (20 pin) and tried to see if it would power on, but it doesn't do anything.

There are no other components attached at this time. I just want to see if it functions. In fact, I haven't even attempted to add any components yet!

It basically powers on for a fraction of a second, then turns off. SO frustrating.

Does anyone have any ideas? I just exchanged my previous board (same model, purchased yesterday) this morning for the same reason. I'm thinking I'm doing something wrong.

Any help appreciated!

Smith

[wazza300]

20 pin? shouldnt it be 24 pin?

[Conners]

Right Wazza I bet its 24 pin and also don't forget the ATX 12 volt 8 pin.

From the manual

1. 1 x 24-pin ATX main power connector
2. 1 x 8-pin ATX 12V power connector

[profJim]

How old is your power supply? Brand? Model number.
If only has a 20-pin main power cable, I doubt that it will work, even if has a 4-pin ATX_12v cable.
An 8-pin EPS12v cable should be used with modern systems.
Buy a good quality Antec, Corsair, Seasonic, or XFX power supply.
A power supply is the foundation of your system, don't try to cheap out with a low cost power supply.
Do a web search on: psu calculator to see what the recommended wattage requirements are for your system.
Even with a lower end, mid range video card, you will need a psu with at least 550 - 650 watts.