i just got this motherboard for a spare unit. 2gig of brand new memory, new video card, and for some reason it wont turn on. the greed led on the motherboard comes on but the pc wont kick on. only thing i can think of is that my power supply is a 20 pin plug and the motherboard is a 24, but the 20 still fits with the top for on the motherboard not covered. would that affect it not turnin on? any help would be much appreciated. thanks.