Moniter wont start up its amber and rest of pc has power

Hey, Im having trouble with my moniter it wont work its stuck on amber.When I switch on the power everything powers up the Computer makes a beeping noise 6 times and the moniter goes from green to amber and then nothing works etc..Keyboard Mouse so I cant use any thing to reset the pc.By the way im only 14. I have found the x2 Ram ports I think but im really unsure what to do. Im thinking about buying another pc. btw on the front of my Dell Dimension 5100 the number 3 and 4 are lit up so Can i get a easy reply 😛 Thanks