Something wrong...

ok guys...my friend gave me an amd athlon xp 2000+ so i put it on and turn it on but the monitor wont turn on....everything is installed perfectly...but i dont know what the problem is...can anyone help me?

EDIT: ok...i tried to fix it by putting my athlond t-bird on it but it still wont work..when it turns on i dont hear the beep and the screen just stays black...somebody help me...