If you’re looking at the hardware, from personal experience, iPhones do last much longer than android. I have been on both ends and I do know for sure my old iPhone 5s still works great so many years down the line. So, I’m guessing you’ve got a good bet if you’re looking for long term usage.
I haven’t used the Pixel 6 Pro but I have been an iPhone user for the past five years and I’ve got to say, no matter how much people may criticise Apple, it has its own perks. Hope you enjoy your new cell phone.
All I know is that the PC doesn’t boot to BIOSis if the motherboard or the CPU's power connector is not plugged correctly. That’s surely the first thing to check.
Recently a Linux consulting company loaded an open source BIOS called Coreboot. It is done to get greater control over fundamental PC software. How wide its benefits are yet to be seen in future.
Whenever I face issues with the hardware, I get in touch with an engineer. I think it's best to get the issue sorted by a professional rather than merely performing some DIYs.