I have the above Mac (Power MacG4-AGP) and I have been able to reach 10.3.9 upgrade with only occasional prohibitory signs on startup, but every installation of Tiger I have tried gives me the prohibitory on each boot. One post here led me to think it might be a problem with the Radeon card, I upgraded the firmware and tried again with no luck. I have followed every tip or hint from Apple's support forums, clearing NRAM etc. Has anyone here had a similar issue? I can give more specs if needed, but I wanted to get a sense of whether anyone had this problem first.
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