How do you diagnose constant crashing issues, or system restore without a backup?

Posted by P102 on Ask Ubuntu See other posts from Ask Ubuntu or by P102
Published on 2010-12-31T14:04:01Z Indexed on 2010/12/31 14:59 UTC
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ubuntu-desktop

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10.10

My recent installation 10.10 keeps crashing on start-up after working perfectly for one day.

Nothing new has been installed. I have just moved from XP so I would be very grateful if some one could please explain to me, as simply as possible, how to do the following...

How to diagnose the problem so it can be fixed, remember it may have to be before the log in.
Is there someway I can do a system restore to its original settings or something without a backup?
If the backup reqires some kind of cd, where can I obtain this from?

all help is greatly appreciated.

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