Thanks Husse and Rivenaught.
I had no access to pc for a couple of days so what I did ( without your answers) is use Gparted and just erased everything. Then put mint 5 back on. All seems ok for now. But if it resurfaces I'm going for these as new lines of attacks!
I cannot thank you enough. I shall be printing these answers off! ( Im making a sort of manual for extreme issues)