Leopard semi installed on imacg5

Got an error message halfway through installing Leopard on my imacg5 (the installer could not validate the contents of 'BaseSystem' package...") but when I try to reboot from my hard drive it tells me that the hard drive is running 10.5. I get a log in screen but it does not accept my user id and password. Tried to reinstall 10.4 using the install disc that came with the computer but no luck with that either. Help!

I saw this same message when I upgraded from Tiger (10.4.11) yesterday.
I ran some memory tests and it turns out that on my Mac (Digital Audio) the third RAM slot on my board is a little flaky in that it sometimes caused memory tests to fail though taking ANY of the memory cards out of that slot made the tests succeed. Normally it never causes a problem but it can trigger this message when installing Leopard.
Since I used "archive and install", the failed installations left my Tiger installation intact so I was able to boot into Tiger and run more tests.
I took a 256 MB RAM card out of the third RAM slot and as soon as I did that, the installation has worked fine. I should also add that as soon as I got the base Leopard OS to install, I was able to use Software Update to bring all the software up to date and then reinstall that RAM in the third slot without incident.
So what sounds like a bad DVD could just be a really unfortunate and inaccurate error message about RAM tests failing on install.
Message was edited by: ziggy29

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Hi,
Use this Info to Contact Apple Support in your Country
http://www.apple.com/in/support/
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Here are the steps to selling*:
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Mac Pros that shipped with Leopard should install from the Mac Pro labelled discs. Those that came with pre-Leopard, you should still include the Mac Pro discs, though if you desire to install Leopard on them, you should also include the Leopard discs that are retail. Leopard retail looks like * and do not say Upgrade, DropIn, or OEM.
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V.K. wrote:
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Message was edited by: a brody

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Hello,
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Leopard semi installed on imacg5

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