The system ran stable for a few days until it just happened again...
Checked my eventlog and it seems like this is happening: AMD External Events Utility Service
"The AMD External Events Utility service failed to start due to the following error:
The service did not respond to the start or control request in a timely fashion."
I can relate to the slow startup after the crash. The black screen is that rainbow screen that I was talking about (see image), no automatic reboot but there is a mini dump file. Is my WX3100 graphics card broken?