I am reassembling an older computer. The motherboard needed a jumper wire on the 24-pin from green to black in order to boot up. After installing Win7 it still requires the jumper to even start (without the jumper, it's as if the system were unplugged, no response at all). The motherboard is a Gigabyte MA790FXT-UD5P. I bought a new 500W Corsair power supply. Other specs are as follows:
AMD Phenom II x3
4GB Crucial Ballistic RAM
40GB Western Digital Hard drive
Nvidia 9800GTX+ Black Edition
New Wireless Adapter
Also, if it makes a difference, I put in a new motherboard battery.
This is not too old and should be fine with all devices including the psu.
what did it mean jumper wire? your psu possesses 24-pin power to the motherboard, and extra 4-pin power to cpu.
what else needed as a non-standard power supply on the mb?
you may need to check external power to your graphics card.