Sinking feeling

The Fit-PC will now not boot at all with the monitor plugged in. If I unplug the monitor when I power the device up and then plug the monitor in afterwards, it boots fine, but I still get the black monitor issue. If I wait for longer before plugging the monitor in, the monitor just says "Signal out of range". I get a nasty feeling there might be a problem with the graphics adaptor on the Fit PC, or it might be the monitor, or possibly the cable, I guess.