What I did was restore system default settings in BIOS and things have become a bit worse! My one core of cpu that is still available is running at 100% flat all the time. Kernel times are slightly slower, at about 70-80%. This is madness. I've switched everything off completely, went to my daughter's computer to post this and download some BIOS upgrading software that'll hopefully fix the problem. Will post when I have new news. Thanks for all the help so far! This is madness!!