IMac flat panel installation problem

I have been trying to upgrade from 10.2 to 10.4 but the machine fails to install off of the DVD. Additionally, we have had problems installing anything on this computer. I repaired all permissions and verified the disk. The installation process proceeds up to the step where you are asked to choose a destination disk. After a few seconds, a message pops up saying that installation has failed. Any ideas?
Thanks

There may be some way to use the booted disk utility from the early OSX
installer disc #1 located beneath Installer in the menubar, to see if that can
help fix anything that may be stopping the existing system from accessing
the newer installer disc (later.) Do not use a later Disk Utility to fix a newer
one or an older one to attempt a fix on a newer system. They don't like it.
Some other user upgrade issues were noted in Mac user forums back when
Panther and then Tiger came on the scene; and some users could not get
their older Jaguar or some Panther systems to upgrade to Panther/Tiger
and of them, some were successful (archiving whole drive clone to external
Firewire hard disk drive as backup, first) in using Disk Utility from the new
OSX installer disc#1 to zero data and reformat the computer's internal HDD
and then it was able to accept the new OSX.
[And, still others, found they had RAM chips that were not
compatible with the newer OSX systems; and had to upgrade
more than just the OSX. Some also put in larger hard drives.]
Other users, were able to simply zap the PRAM and do a few other basic
things, and their machines were able to upgrade from 10.2.8 to 10.3.x
and a few without much issue, to 10.4.x. [I had some issues with an older
PowerMac tower trying to go from 10.2.8 to 10.3.2 and the retail installers
never could work. I finally decided on a different later Macintosh and then
when a neighbor's friend said he was looking for a PowerMac, I sold it...]

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    Hi Chris CB, Yes, I was just told about MacTracker the other day... It's amazing, is'nt it! I know that information took a LOT of time to compile. I downloaded MacTracker the other day and am still amazed!! I wonder why Apple never did this themselves; them being the ultimate source and all.
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