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Valis, yes poor phrasing on my part.

If the batteries were a problem within the UPS, it should have protections that will prevent damage to attached devices. The UPS will not help in the event that components in the computer itself died.

Assuming the final card is also still functional, I am suggesting the most likely points of failure. If that card is now dead, it may be the source of the event that damaged other parts of the system.

In terms of probabilities, the source of the event that caused damage is far more likely to have occured within the computer itself (main, PSU, DSP card). It's not impossible that one of the PSUs caused the damage, but it is a very low probability.

Most of the failures I’ve had on computers have been the power supply or a hard drive back when we used spinning drives. Every time I’ve had a power supply fail it’s taken out something on the motherboard, no matter how carefully I buffed the power being supplied to it. I use more than just a UPS, I make sure that I have full sine wave filtering on the UPS and I use upstream voltage regulators to clamp down on the voltage before it even reaches the UPS. And yet motherboards still fail, especially those made between 2003 and 2008, there were a lot of flawed capacitors running around back then.

I took the dead FSP SAGA+ 400R PSU apart to retrieve a Noctua 120mm fan I had installed years ago. Big cracked solder joint failure identified, likely causing the death of my PCI bus/slots. Somewhat perplexed that everything else still works fine. A tribute to Gigabyte perhaps.