I just spent 3 hours undoing the damage done...Which includes the following: 1. CPU running at full speed when nothing is making or asking it to do so, Yep! run away CPU speed. 2. My drives all disappeared in the BIOS. 3. Bios screen distorted, shows up 1/2 size on the horizontal. My saving grace. The only drive still functional/reachable was my DVD drive. Solution: After much thought I realized it had to be the Mint Kernel up date. I do updates everyday. So i took me a while to remember I had just done two kernel updates.both from Mint updates. Actions taken: I immediately un-clocked my CPU. Made desktop. I had set it to 35 down from 48. Regained desktop and found it at 35 as expected...But running 100% at 35. I used my DVD to do a restore. Fortuitously while I could no longer see my drive in the bios Mint could reach my backup and do a restore. Regained desktop and found things as the should be, Re-clocked my CPU to 4.8 All seems well.