right, not sure it was the most accurate way to do it, ie, my probes aren'y the smallest, so i fixed a scalpel blade to the probe to get at the side next to the chassis, it may have affected the reading, but i'm getting a 9.5 to 10.1 ohm across the fuse.

i did notice that the front screen comes on if i short the neg of the plug to the chassis, so being rather impatient i plugged the drive back in and... it booted just fine, all the menu's and playlists are there, so just this power problem to cure now!