Hello again, Success!! I do NOT recommend this process at all BUT --- I reversed the batteries in my 41CX and left it for 5 minutes. When I tried to switch on I had the same results as before. Had to press the ON toggle,the ENTER key and the back arrow and the thing would start but not do anything properly. It did a DIR of my tape drive and even import a program but then it would go to PACKING and lock up. I was really fed up and in desperation I tries to throw the thing out of the window!!! I missed (saved broken glass) and the 41 bounced off the timber surround onto the floor. When I picked it up it said "MEMORY LOST" It now works perfectly. Just like a naughty child, a good thumping brought it back to normal.
Thanks to Garth for the information. Regards,Den