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Good luck hunting.

Don't bother with the drive. If you can actually feel the head jumping then that HDD is finished. Each time that head jumps up it's going to come down and scratch your platter. There's no recovery from that. RMA it.

I agree. Especially if the GPU asks for lets say 550 watts and the PSU tries to deliver that, while also delivering another 100 watts to the rest of the computer. You can't always expect safety systems to safe the day. They can fail and Corsair can reject the RMA because your GPU is out of spec.

Are you able to replace the 1070 with another GPU, any GPU will do.

It all depends on your CPU and motherboard. Update your bios to the latest version first, Then set DOCP and then manually select speed to 2133Mhz. Go up in speed with each restart until you hit instability and let us know.

Many printers share drivers. Use a driver from from the newest printer the same family. If that doesn't work then try to use a driver from the same class of printer. If possible find out what driver HPLIP is using. It shouldn't be using your exact driver.

If it's not USB then I would suggest checking if your computer is grounded correctly. Edit: You can still shut down your system without a keyboard and mouse. Just tap the power button, or as it's shutting down pull both out.

Unplug all your USB devices, and if needed also unplug all your internal USB devices. One of those are probably still drawing power. My external USB Blu Ray drive does exactly what you're describing.

Either you had a corrupted bios or you input an incorrect setting in bios. Pulling the battery will reset the motherboard to default settings.

Some motherboards have multiple Sata chips. For instance my motherboard has 6 ports. 4 are controlled by AsMedia, and 2 are by Intel. Check your manual and it will tell you what ports are controlled by what controller. You may find that one of your controllers is dying and that's causing all 4 to die at once.

After a few failed boots it should auto switch to the second bios.

There's not much you can do about coil whine but you can reduce it slightly. A better PSU can often help, Lowering the voltage on the parts drawing the power, Limiting frame rates to lower the power draw, Kick your fans up a notch if you don't mid fan noise, A noise cancelling case, buying noise cancelling foam and placing it in the case yourself.

The small holes I wouldn't worry about. Focus all of your efforts within the slots. Don't power on the system until you're completely happy with the cleaning. Having non conductive paste is a double edge sword. Yes it will stop pins from shorting, but it will also add resistance to each pin and if the power ones are not cleaned enough then you can get burning. Those holes are gaps for the pins to be passed through when the dim slots are being made. There's no physical way for the pins to touch each other in those small holes, so neither will the paste. This will however void your motherboards warranty. Doesn't matter what issue the motherboard has, once they see paste on those slots then will send it back.

Have you got the front panel connected to the correct pins, or shorting the correct power pins?

I would use IPA, or a specific TIM remover. Pour a few drops into the slot. Get a credit / debit card and put a thin cloth over it. Like a thin smooth t-shirt. Don't use tissue. Put the card and shirt into the slot and wipe with a up and down (in and out motion). Don't slide the card side to side, you could bend a pin. Repeat as often as you feel needed.