New pc build(with 2nd parts) not booting, so trying to figure out whats the cause. It switches but doesn't boot, its not shorting either, so.. Just wondering if some of the experts could give me some advice on this. Cus i'm useless! Have a gigabyte GA7-ZXE, athlon 1800, abit siluro 64mb card, 2 times 256 133 sdram, 350 watt aopen psu. There is a green light on the top left of my mobo. Should it be on when i switch the psu on or on when i actually switch the pc on? When should it light up? Also is their a ram test light on this motherboard because i've seen the label, but are not sure what it is relating to. Cheers for any help relating to these misterious lights.