Well if it was loose, it would have been reset when I changed the slot.
After the change I tried again - no change.
ANYWAY
I had a new modem on the shelf so popped it in the old slot and everything works.
Now I am a hero to my friend.
I know HOW horrible it is when your modem throws a wobbly... You feel like you have been abandoned by the world. Left to fend on your own. Brrrr sends a chill.
SO
I would just like to thank you for your kind thoughts and ideas on this problem and as to why it occured we will never know, just speculate.
Like you said, it could have worked loose.
Anyone for a beer?