What kind of cable are you using to connect your computer to the monitor? Is the cable plugged into the video card or the monitor? What are your specs? Did you try an external build before you built the computer inside the case, or is this your first attempt at turning it on?
This issue could be caused by a number of things. We have a guide that was created to troubleshoot this type of problem. There's a link to the guide in my signature.
This issue could be caused by a number of things. We have a guide that was created to troubleshoot this type of problem. There's a link to the guide in my signature.