Vga loss

[rokytnji]

look at the end of /var/log/demsg text file for any reasons.

Code:

cat /var/log/dmesg

or

Code:

sudo dmesg |  tail

I guess. But I would rule out a faulty vga switch first if me in your shoes. Since that is easy to do. Just disconnect from vga switch to screen and hook direct while screen is blacked out.