ibook wont turn on!help!

hello,i got my G3 12" ibook from ebay,everything ok and it was lovely,then there were some problems shutting it down,then starting it up,but if i left it alone for a day it was ok-then it stopped working-the screen freezes on the page with the apple logo and the round spinny thing and i cant get it any further.Initially a notice came up telling me to restart the ibook,but now it just freezes-what can i do?

Thanks in advance :doctor:

Hold down Command (Apple) + Option (Alt) + P + R on boot to clear the Parameter RAM (PRAM), turn on and wait fpor two chimes, then release.

If not, try this: http://docs.info.apple.com/article.html?artnum=14449

Vicky