I have a XPS M1530 laptop that I use to play videos on my plasma. Everything was working fine and I even watched a movie tonight.

But now it doesn't detect the HDMI. My blu-ray still worked and so did my girlfriend's PC.

I have looked at the mobility center and it sometimes says device connected but when I try to mirror/dual/external it doesn't do anything. Nothing shows up on my TV and it doesn't switch to the display when I do anything.

I fear that the HDMI thing in my laptop has been broken. Is there a way to troubleshoot that maybe?