Drive problem

Basically my USB2 external drive wouldn't start this morning. Checked the fuse which was OK so assumed (and prayed) the power supply had packed up. Took the drive out of the box and attempted to install it inside the HP Pavilion. This has a case which has some oddities - a large air vent box and (unusually) a removeable drive cage. I found the service manual on a PDF file on the HP and attempted to print it out but the HP PSC 1205 insiste on grabbing about 10 sheets at once. So I cancelled and copied the file over the network to a Win 98 machine so I could read it on screen while working on the Pavilion. Anyway the manual insists that the drive should be set to cable-select, but when I booted up the HP BIOS (press F1 before the initial blue screen) couldn't detect it. By this stage I was fearing that the drive and the 80GB of data on it, had gone for a burton. (?) but I changed the drive jumper to slave and it was immediately recognised (phew!),