Re-Installing Operating System

I have an ibook G4 and was having difficulty with getting it to start up. It was recommended that I clear my hard drive and start from scratch. I've done that (after backing everything up of course) ... but now I can't get the computer to boot up from the installation CD (it wouldn't do that before I erased my hard drive either). Is there a way to install the operating system with the computer attached as an external drive? Any other suggestions would be greatly appreciated!
Thanks!

HI Sara,
Check the hard disk for errors. Restart your Mac while holding down the C key, pressing the power button and inserting your install disk all at the same time. An Installer window will open, but do not proceed with any installations. Instead, from the Menu Bar, select Utilities/Disk Utility. In the Disk Utility window click First Aid, and then click Verify. If Disk Utility reports errors, click Repair. When Disk Utility is finished, from the Menu Bar, select Utilities/Startup Disk. Select MacintoshHD 10.x.x and click Restart.
To check your hard disk’s S.M.A.R.T. status: Open Disk Utility, in the Utilities folder in the Applications folder.Select the disk in the list at the left, and look at the bottom of the window for a field named “S.M.A.R.T. Status.” You can check the S.M.A.R.T. status in the Disk Utility window when you boot from the your install disk.
Carolyn

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