iBook will not boot from cd

Having a problem with my ibook g4(late model), had a problem with my previous 80 gig hd and just replaced it with a 160 gig. Now i cannot boot from tiger disk that came with unit, just a grey screen appears with a question mark on it. also when I boot holding down the option key only a swirly arrow appears on the left and a regular arrow on the right. Had no previous problems except i was told by geeksquad that i needed a new hard drive due to the old one being corrupt, would boot fine before but ran slow. Any suggestions would be appreciated. Also i have reset pram and done the various steps of reset all after entering the alt+option+f+o steps.

The new 160G is a western digital purchased a few days ago. I will try, was hoping to have a solution as I put it back togther before testing it. The boot disk is the original tiger disk.