Thanks heaps fella's for the info. Copied it to text and to external. very helpful indeed. This whole problem came about because i, in a very silly move modified, set up how the system boots. redo grub in other words. I have quite a few kernels still installed. I downloaded and installed one of the newer kernels. In short my A8N-SLI Premium booted it but it was slower than the .a64's available. I had previously prettied up the Grub Graphical Boot Menu, removing older entries, but did not, through Synaptic remove any of the kernel iso's. So i knew they were still on the system. When i found that this later kernel was no good to this setup, i changed back to what i thought was the previous Kernel i had been using. I picked the wrong one, did not open up the advanced section and check what iso image was assigned to the entry.
The one i chose, had no ISO assigned to it. That's where it all started, no fault of the system, only my not taking the time to check which ISO was assigned to what! So i suppose the moral of the lesson is, If you are going to change, the name of the entry, remove entry's from the menu, be sure you know it has a kernel assigned to it which is proven to boot properly and leave another, that you know boots fine on the graphical menu in case you get something wrong or the new one you try gives problems! I have learn t my lesson, fixed up all graphical screens on my machines and now have your guide as to how to get one back should something go wrong. Many thanks for all your help from all and sorry for the late reply fella's.I shall now mark it as solved. Thanks heaps, Jeddaboy.