Hi hugzie,

Try the steps in this video and let me know how it goes:

My Alienware is not booting and shows a blinking cursor

the problem is i cant find the disk 

okay i found the disk and I've put it in but now its still the same the screen is saying no signal 

You tried the steps in the video right?

Try to re install the Operating System:

How to install Windows 7 in an Alienware Computer?

if you can see the mouse then windows in loaded.  if you right click do you get a popup window?  Did you try connecting to the other graphics ports on the system?