Went out last night in the car, HU was fine. Got in the car this morning, started it, and nothing. Looks like there is no power to the HU.
Checked the fuses, and come into work to have a look on the web. Been back outside to try it again, and it's now working! I did turn the ignition off and on again a few times before, and it still didn't work.
Much be that time of the month for the car.