I have a Compaq Presario V6000. Whenever I try to turn it on, the screen does not come on, there are four beeps, and the power light on the button and on the front of the computer flash continuously. The plug light comes on when I put the power cable in it. The lights at the top and on the mouse come on, but there is nothing on the screen. I can't even get it to a point where I can run the OS disk but I can open the disk drive. I could use a little help. Anything would be helpful.