alrite.. try and remove all devices and go to basic [mobo, cpu, psu, vid, sound], see if you get any beeps or if it works. if it does work, then one by one install each component untill you find the one..
check if your mobo has an onboard video plug and try that instead of the card.. if you dont, try and borrow/get another vid card and test it works or not, likewise with your vid card on another pc....