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Hi,
I suppose you have tried reinstalling the whole operating system and drivers, and thus as you say a driver problem can be discarded. The three failed AGP cards with overheating problems make me think it could be all about a degraded or damaged power supply (be it the power supply itself, or some intermediate power converter on the motherboard) that doesn't provide a clean voltage to the AGP slot, and that has irreversibly damaged all your AGP cards. That would be consistent with the fact that the PC was working correctly in 2015, but later on had some degradation on the power supply components (mainly the electrolytic capacitors), damaging all the AGP cards when you turned it on again recently. Another possibility is that all the cards have received an electrostatic discharge (ESD) during their manipulation outside the computer, or during the connection of the component video cables with the VCR, but I think the bad power supply theory has a better chance.
If you really want to use any other ATI AGP card, I would first replace the power supply, and then check the motherboard for any bulging or leaking electrolytic capacitor that could indicate a power supply problem, before putting another card at risk. I would no longer use this computer until these components have been verified, as it could keep damaging other parts, so I would discard capturing with it using any of your other available cards. From your available capture devices I think the only one with the seal of approval of this forum is the Pinnacle 710, you could investigate if it is compatible with newer computers than this P4 setup.
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