Black Screen on startup, help!

> Hello!
>
> This didn't happen to me before. Of course I had to press
> reset, which resulted that it brought up the "we are
> sorry..., also black screen, but with the same options as
> when you press F8 on reboot.
>
> The default, with 30 seconds left, was on "Windows XP",
> so of course I didn't change it with the arrows,
> to "restore to a previous state".
>
> My question is, was this just a coincidence and probably
> I won't have to worry about it happening again or should
> I repair the master boot record by using the FIXMBR
> command from the Windows XP Console?
>
> I also got a list of causes, from the webpage:
>
> "This behavior can occur if one or more of the following
> elements are corrupted: Master boot record, Partition
> tables, Boot sector or NTLDR file".
>
> What should I do, can someone offer an explanation?
>
> Nick