"As far as I'm aware all Core 2 processors will need the 4 or 8 pin power connector plugged into the motherboard.
Without it you will get similar symptoms to your issue.
Look on your power supply for a 4 or 8 pin plug. It will be on its own cable. It will either be a 2x2 or 2x4 pin plug
X X X X
or
X X X X X X X X
The connector on the motherboard is generally located near the CPU socket.
It will probably be an 8 pin connector, but 4 of the pins may be covered with a small piece of plastic.
If the power supply has a 4 pin connector, just plug it in. If the power supply has an 8 pin connector, remove the cover from the motherboard, then plug in.
The connector will only go in one way, and there are no other connectors on the motherboard that are similar."
"Curiously there is a TomsHardware discussion on the ""antec basiq 500 watt"" running a ""GA EP45-UD3R"" that does not overclock. So, it must be booting in the first place.
There is another discussion on the 12V rail too. But, again this is an overclock discussion where the board seems to be working (and, with a different PSU)"
