Kevinb123213

TL;DR
Files ending in a dash seem to indicate some sort of corruption.
 
Long version:
Found the solution. I think I should share it as it may help others.

Apparently my setup cuts power and resets when I passthrough one of my GPUs - specifically the Nvidida Quadro K600. Knowing that I had an unclean shutdown, I went down the thought processes of data corruption. Which made me remember, a while back I noticed on a corrupted copy unraid usb, the dash ending files (syslinux-) appeared there too.
 
So, I ran the following and pressed option 2 to restore from backup.
 
fsck /boot  
At this point I restarted and was able to start libvirt.
 
Now time to figure why my K600 is causing reset.
-Kevin
 
 

TL;DR:
You can enable blanking (black screen output) as a screen saver by doing the following:
1. Backup slim.conf
cp /etc/slim.conf /etc/slim.conf.orginal  
2. Edit slim.conf
nano /etc/slim.conf  
3. look for this line.
xserver_arguments -novtswitch -allowMouseOpenFail -quiet -xinerama -v -s 0 -dpms -fp /usr/share/fonts/TTF vt07  
4. Change to the following
xserver_arguments -novtswitch -allowMouseOpenFail -quiet -xinerama -v -s 1 dpms -fp /usr/share/fonts/TTF vt07  
 
You can disable screen output (no signal output) as a screen saver by doing the following:
 
1. Repeat steps 1 - 3.
2. Change to the following
xserver_arguments -novtswitch -allowMouseOpenFail -quiet -xinerama v -s 1 dpms -fp /usr/share/fonts/TTF vt07  
DISCLAIMER: 
Do this at your own risk. You are responsible if you break your unraid setup.
 
Edit:
Is there really no way to blank the output of the screen?