Double check the power supply connections the mother board. Reseat the ram and make sure they are in the right slots (check the manual) ensure the hard drive has power connected to it, as well as the video card. Remove all unnessary devices and cards. You will need 1 harddrive, the video card, the ram, and a mouse and keyborad to start out. If you have 2 sticks of ram take one out, if it still doesn't work put that one back and take the other one out.
Post again once you have tried that.
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