MA 78GM-UD2H - Power Connection

[cliffg]

I have just bough one of these boards and a bit confused about the power connections required on the motherboard.

There are two connectors on the board a 24 pin one and also a 4 pin one (marked ATX)
My power supply has a 20-pin and a 4-pin connector, which plug into the 24-pin connector, but there is nothing to plug into the 4-pin socket.

My other Gigabyte board has a 20-pin and a separate 4-pin connector.

I am even more confused after reading the manual!

I cannot get the board to power up and wondered if this is the problem?

Glad of any advice.
Thanks in advance. Cliff

[oggmonster]

How old is your power supply, most have the 24pin + 4pin if you've only got a 20pin and the 4pin you can get an adaptor to change from 20 -> 24. But in all honesty if your PSU is that old, i'll be tempted to buy a new one.