I did hook up an HDMI cable into it and it showed up on the TV, so it doesn't look like the GPU isn't working. Does anyone have any suggestions as far as what it could be?
Do you mean that the Windows desktop showed up on the TV?
If so, look at the F keys and you should have one that looks like a monitor of sorts. try pressing that a few times slowly. (give it 10 seconds between presses)