Blank blue screen at start up

Hello,
I have a newer iBook and somehow it got stuck on blank blue screen upon startup. The normal screen no longer appears where I am expected to enter my password etc.
A friend was recently using it only watching videos & movies while we were traveling.
Not sure if she accidentally entered a command but, now I can't use the computer at all.
How do I reboot/reset it without losing my data etc. Or is there a simpler trick to get UN stuck from the blank blue screen?
Thanks for any help.
~Day

Hello,
Which iBook model do you own? You can select from this list.
http://www.everymac.com/systems/apple/ibook/index-ibook.html
You may wish to try resetting the PMU by following these instrcions
http://support.apple.com/kb/ht1431

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