My iBook g4 keeps requesting restart...
Hello and welcome to the support community.
First try resetting your iBook's PMU by following this guide.
If that fails to work, then it could be a problem with the memory module found under your keyboard.
You can try removing it and see if it request a restart or try replacing it with another module.(If you have one)
Other causes of this could be hard drive related.
Retrieving data ...