My Hackintosh is struggling with a 2 year hibernation

Clearing the CMOS (momentarily jumpering those two pins on the Z170N motherboard) might help.

wstrohm said:

Clearing the CMOS (momentarily jumpering those two pins on the Z170N motherboard) might help.

Click to expand...

The OP has just replaced the CMOS Battery, so that shouldn't be necessary.

Hi, Edhawk.

Thank you for your response.

Can you please define "borked." Corrupted? Or damaged?

I've tried to boot up with delete, F12, tried flashing it with end.

It's caught in a loop.

I cannot get it to go to the BIOS screen or to somehow boot from USB.

Just a loop of rebooting.

Eric

I'm prepared to do a clean install but... I don't see how I can do that in the situation I'm in right now.

ejmaroney said:

Hi, Edhawk.

Thank you for your response.

Can you please define "borked." Corrupted? Or damaged?

I've tried to boot up with delete, F12, tried flashing it with end.

It's caught in a loop.

I cannot get it to go to the BIOS screen or to somehow boot from USB.

Just a loop of rebooting.

Eric

Click to expand...

Hello,
Try to remove/disconnect everything not needed for troubleshooting (keep it simple) :
- remove the power cord
- remove the new battery .....
- disconnect/remove storage(s), nVidia graphics card ( CPU has iGPU ), PCI(e) adapter(s), etc
- remove usb dongles ( mouse, wifi, BT, etc )
- use a proper keyboard ( PS/2, USB )
- remove some memory stick(s)
- re-seat some stuff/cables, re-check connections ...
- ... wait a few minutes, put the battery back.
- test it again.

Edhawk said:

It sounds like your Main bios is borked.

(...)

I can't remember how you force the system to automatically boot to the Secondary (Dual) bios chip on a Gigabyte motherboard, so trying to manually upgrade/re-flash the bios may be your best option.

Click to expand...

I found two ways to handle dual BIOS.

First - as Edhawk already mentioned - pressing F8 during power up should bring up some sort of screen where it should be able to switch. But I have never seen that myself, just repeating what the internet says...

Second I found this:

BIOS-Recovery-Methode auf einem Gigabyte-Mainboards mit DualBIOS:

1. Netzteil ausschalten und den Powerknopf 10 Sekunden lang gedrückt halten.
2. Netzteil wieder einschalten und den Powerknopf solange gedrückt halten, bis der PC an und danach wieder komplett ausgeht.
3. Powerknopf drücken. Der PC bootet, der BACKUP-Chip kopiert seinen Inhalt auf den MASTER-Chip und rebootet wenn er fertig ist.

Click to expand...

or google translated

BIOS recovery method on a Gigabyte motherboard with DualBIOS:

1. Turn off the power supply and press and hold the power button for 10 seconds.
2. Switch the power supply back on and keep the power button pressed until the PC turns on and then turns off completely again.
3. Press the power button. The PC boots, the BACKUP chip copies its contents to the MASTER chip and reboots when it is finished.

Click to expand...

But as switching from a corrupted main BIOS to it's backup should happen automatically, it's seems to be more likely that something is wrong with your hardware, I'd see the power supply and/or connections as first suspicious option.