Now I'm pissed off.
I finally got around to looking at my £20 15GHz sig gen on my new 22GHz spectrum analyser. Didn't work, but finally figured out the previous owner had moved SMD resistors to turn off the on-board 100MHz source and use an external sig gen. Fixed that, and my joy knew no limits.
Came back later, and the dual boot Ubuntu / win7 laptop refuses to get past dropping me into a grub rescue prompt. Bugger, bugger. No, I don't have a win rescue disc.