Can't re-instal Tiger (OSX 10.4). backe

I was running OSX 10.4 on my Macbook Pro. I severely damaged my system by (I assume) attempting to restore from a faulty backup. Having tried to recover by less drastic means, I finally decided to erase the disk and restore OSX 10.4 from the install DVD. I tried to boot from the install DVD, but failed. I loaded the install DVD into the drawer and tried booting with the 'c' key pressed (it hung with the clock icon turning), and tried booting with the 'alt' key pressed, but the DVD was not offered as a boot option. I then booted from a 10.4 system on an external firewire attached drive (under which I am currently operating). The install DVD then showed up in Finder, and I clicked on the 'Instal Mac OS X' icon. This produced a message saying "OS X 10.4 cannot be installed on this machine. Please consult the documentation for a list of supported Macintosh computers".
I assume I must somehow have modified some bit of ROM. How do I recover?
Nigel Martin

Thanks, your question made me realise my mistake. I have 3 machines running OS X 10.4, and thought I needed only to keep the one copy of OSX 10.4 install. But prompted by your question, I tried out the install disk on another machine, a happily working intel iMac, and got the same message. So I looked at the "Read Before You Install" file, and find that it is for PowerMacs only. Annoying.
I hope I can find the install disk that came with my MacBook Pro, but I see from http://discussions.apple.com/thread.jspa?messageID=10194423&#10194423 that I can get a replacement (at a price).
Thanks for the penetrating question.
Nigel Martin

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