I recently bought a corsair vs550 psu for my computer. My computer specs are i5-2400 processor, gigabyte h61mds2 motherboard, nvidia gt 630 gc, 2 internal hard drives and a 4 gb ddr3 ram. As my previous psu started giving problems i bought this new corsair psu. But when i try to connect it and on with it, it ons for a split second and turns off. My motherboard supports a 4 pin for proccessor where as it has a 8 pin of two 4pin. I used with both the pins but with same result. My motherboard supports a 24 pin connection. I tried to remove and tes the psu by shorting the green wire and black wire with pins. The psu runs when pins are held firmly and at correct angle. But it still doesnt run my computer. So is there a problem with the new psu?