hello all
Thanks for the reply Lisi, I did find something to try on the kubuntu forums (sudo nvidia-settings) but when I tried to enter this into the konsole it asked for password,  but it did not allow me to enter anything at all.  So tonight I reinstalled kubuntu and it seems to be ok now, BUT!  I thought it would reinstall over the old one oh no, now  i've  got  kubuntu  twice  and ubuntu  how can  I delete the old kubuntu.  there are 116 updates ready to install into kubuntu should I go ahead or not because I'm concerned I will end up with same problem as before.
                                 thanks terry
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