The fact that it still runs and can even connect to the net (however unsafe that may be with its current state) has delayed the project.

The power supply is flaking out. When the magic goes, it goes.

One of the more amazing things was the monitor. It manages to power itself via the DVI cable.

Yeah, the internal DC/DC board is known to die if you load the machine up with a CPU/GPU upgrade, even worse if you use the ADC monitor too. It's not cheap, but Artmix makes an upgraded replacement. I promise if you get into modding the Cube it will be a million times more fun than turning such a rare machine into Yet Another Intel Box ;) https://artmix.com/products/product/stratos-technology-power...