Problem now fixed - Thanks for replies.
Had a moment of lucidity and disconnected cables from ethernet switch for 2nd and 3rd PC (not booted) . Lo and Behold, Knoppix 3.4 booted and gave me instant access to the 'Net.
Reconnected 2 cables and booted Knoppix again - All worked 100%.
Must have been a loosely connected cable at the switch for PC 2 or 3, and even if they were not switched on, Knoppix timed out trying to do a DHCP Broadcast. That's all I can think of given the circumstances.
Thanks again,
Bill
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