So I powered down the computer, and restarted it. However, this time, I got no input from the computer, my screen telling me it couldn't detect anything. I made sure that it wasn't the monitor's fault by hooking the cable up to another monitor, but to no avail.
I'm pretty sure that a piece of hardware has broken down, but I'm not sure what it'd be. I'm using an Nvidia graphics card. I was considering removing it and seeing if connecting the cable to the inbuilt graphics card would do anything, but I decided to consult with someone who knows more of hardware then myself first.
Thanks for any and all help