Thanks for the reply,
yes I was very suspect about an IDE controller that cannot be found with google, I will follow up with a visit to appropriate site here.
I have only the video card installed now as I removed all hardware in attempt to isolate the problem and have now installed the latest Intel drivers, in fact, I ran 'slim drivers' to identify any out of date ones, but noted them and went to the official sites to download.
I have done all the memtest things and you are probably right, the motherboard will have to go, Not much good on the net about it and the X68 seems a better option.
will keep you informed,