Chris Walker cdw_alug@the-walker-household.co.uk
It offers a failsafe and another kernel option - 2.6.39 (I think) and the 2.6 option works which is how I'm writing this. But how can I faultfind the main kernel non-starting?
The above doesn't say what distribution is in use, but generally, if it uses grub, press e to edit the command-line, edit the boot lines to try to disable all graphical splash stuff that hides the debugging output and then b to let it boot. When it fails, note any errors or whatever (maybe use a digital camera?) and then those should help you find help on search engines or forums, if it's not obvious (which it often isn't).
Hope that helps,