for power monitoring stuff I bought a prototyping shield/hat for the raspberry pi. I'll probably put an arduino onto it, to control some WS2812b LEDs. And some pwm control for the mini fan.

[update]

I also got a LVDS converter board for an old macbook screen. I just hooked it up and there it was, FREE blue magic smoke! First inspection let's me assume that the LVDS connector has a cable that shorts the inverter leads. I'll have to write the guy that sells it, but my hopes are low that he actually knows what the problem could be. So let's hope for a refund and a still working display.