Dell XPS 13 Sputnik3 (Ubuntu 14.04) cannot find display-port.

Here is the story. I've used the mini-display port from my XPS13 for about a year with an ASUS 2560x1440 res external display, via a mini-DP to DP connector. This has worked fine for 1 year.

This afternoon, I tried to connect my mini-display port to a projector via a mini-DP to HDMI, and nothing happened. I had heard that sometimes there were issues with projectors and XPS Ubuntu DisplayPort, so I unplugged and didn't woory about it.

When I came back to my desk and plugged in my usual external monitor, my XPS 13 was unable to find the monitor. Usually when that happens, I try and manually add a mode with xrandr, like:
xrandr --addmode DP1 2560x1440
xrandr --output DP1 --mode 2560x1440 --right-of LVDS1

When I went to do that, the DP1 output didn't even show as disconnected...this caused (and still is causing) me quite a fright.

Output from xrandr -q:
calvin@silversputnik:~$ xrandr -q
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
1920x1080 60.0*+ 59.9 48.0
1680x1050 60.0 59.9
1600x1024 60.2
1400x1050 60.0
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1360x768 59.8 60.0
1152x864 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Any help would be appreciated, do I need to reset xrandr? or reload a kernel?

Kind Regards