|thanks for your response:|
-remove the RAM, yes I did, I tried just one , I switched them too, no beeps, just the sound of the fans. and yes it used to beep on startup.
-the fans are working, there is light in my crosshair motherboard, the HDDs doesn't make the normal noise but after a while they got warmed, my USB external USB HDD sound as it worked . So I am not sure if the power supply is the problem.
So, How can I check or test the Power supply?