Thanks Oatley, that's the better way to create a minimal setup. Below the list of packaged that are still installed. It's not completely minimal but almost. I've never found why my screen went blank but commenting out #hdmi_drive=2 in /boot/config.txt fixed it, as my screen doesn't support 1080p res...

I've removed +- 500 packages and the system seems to be stable. If you're interested I can give you the yum.log that shows which packages I have removed. I do have one issue, the HDMI output to my computer screen is no longer showing anything (no bootup, no login tty). No clue which package I should...