Hello everyone,

I received this dusty (literally) Vectra 386s/25 PC with a dead power supply. I tried buying a refurbished supply from apparantely less than reputable sources, both came dead. So I'm trying to rig my own power supply using this pinout: https://pinoutguide.com/Power/hp_725_power_pinout.shtml.

My issue is with this 2pin header sitting on the motherboard. For the life of me I can't figure out what is it for and what voltage should I apply.

I looked inside the power supply, this connector is isolated from all the rest, and I buzzed the motherboard trying to find which chip is powered by this, no luck there either (was only able to tell that R21 is sitting across both pins).

Hoping that someone could shed some light into this mystery. Thanks.