Hi, and welcome to Apple Support Communities.
Which exact iBook model is it?
You can choose from this list:
http://www.everymac.com/systems/apple/ibook/index-ibook.html
Which version of the operating system is it running now?
How much RAM is installed?
What kind of optical drive does it have? (CD-ROM, CD-RW, DVD, Combo, or SuperDrive?)
Answers to these questions can help us help you.