Leopard cannot install

have a new MB and have the install dvd for os x leopard as well. I am running tiger at the minute but when i go to install leopard, after choosing english as the main language, it says leopard cannot be installed on this computer... any ideas??
the leopard disk came with the mac not from buying it seperately
cheers

Two things.
Did you try installing without using the wireless peripherals? If not, give that a go.
Howver, before you install, get a bootable, external HD, and make a bootable backup/clone and ensure that works like the original. That allows you to revert to the previous good state without having to reinstall anything. Then, peruse these
http://docs.info.apple.com/article.html?artnum=106941
http://www.macmaps.com/upgradefaq.html
http://www.macmaps.com/backup.html
http://www.thexlab.com/faqs/installswupdates.html
http://www.thexlab.com/faqs/backuprecovery.html
http://discussions.apple.com/thread.jspa?messageID=5757385
http://discussions.apple.com/thread.jspa?messageID=5666369
http://discussions.apple.com/thread.jspa?messageID=5646414

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