Many Thanks for your helpful reply.
It is now fixed!!
I searched for YAUDIG in the forum and using the instructions reloaded the drivers for my Windows Vista PC which has never worked for the custom rom load using ADB but was ok for the other two USB functions. This was due to the Android Composite ADB Interface driver loading but not running due to the Error 10.
This time the driver was just fine. Highly recommended document.
I then successfully connected my original Vega and reloaded the R8 Custom ROM without problems.
Then I swapped to the new Vega and tried that with all the important settings identical to the first Vega and it failed to load the Custom ROM.
Looked in Device Manager and there was no Android Phone entry.
Restarted the Vega several times and turned off and on Debugging without success. Plenty of beeps but no driver running.
Then with the Vega still up and running I disconnected the USB cable and reconnected it and suddenly the Android Phone ADB driver loaded and I was able to complete the upgrade.
Why it failed to connect / load the driver before I do not know and since then I have started up the Vega with the USB cable connected and no problem.
Dodgy USB connector? Never had problems with file transfers and flashing the Base ROM.
Is the level of charge significant? At all times the power supply was connected but the battery was not fully charged.
I'm a happy bunny now.....
Edited by musoguy, 29 June 2011 - 01:33 PM.