Hello,
I have just powered on my PC for the first time in a year, however I cannot get it to display. The PC powers up and the blue light is on but I can’t even see any boot messages; nothing shows on the display.
I have tried changing monitors, HDMI cables, but to no avail. Any ideas are appreciated.
Remove the bat and plug again, power on the board and upodate the BIOS and EC firmware. 
Thanks very much for the reply. Unfortunately still no display. Waited 5 minutes with battery unplugged and tried again to blank display.
I can see the read light on my Ubuntu live USB flickering so I’m assuming it’s doing something, but my monitor is blank.