Black Screen - Intermitent BEEPS

A common problem is when your computer's screen remains black and intermitent beeps (shorter or longer) are heard from inside of it.
Usualy, when this happens it means that your mother board and processor (CPU) are working properly.
There is a code of this beeps that can help you in identifing the problem:

One Beep	Everything works normal and Computer started fine
Two Beeps	POST/CMOS Error (checking CMOS settings)
One Long Beep, One Short Beep	Motherboard Problem (checking mainboard)
One Long Beep, Three Short Beeps	Video Problem (checking video adapters)
Repeated Long Beeps	Memory Error (checking RAM modules)

Go to the section above coresponding to your problem.