Had this issue happen today suddenly with my G531GV-DB76 laptop.
The screen started to have vertical ghost lines. Thinking might be some issue with my HDMI cable of my external display, tried to remove and plug it back. But the issue was still there.
Thinking restart might solve the issue, when restarted the screen went black, i can hear the ROG startup logo but the display went pitch black. Een though i can use the laptop connecting to external montior. Once boot up , the laptop screen went completely black, but external monitor was working fine. In device i can only find a single monitor which was my external monitor.
Then i tried updating Intel graphic card driver as there was an update, after updating the laptop screen reappeared but, again i can see the vertical ghost lines.
Then upon checking the refresh rate, it was set to 60hz. i tried to set it to 240Hz, but again it went to black screen mode. So reverted back.
Would be glad if anyone can help me resolve this issue.
BIOS, Drivers, everything is upto date.
Nvidia doesn't recognize the laptop's display but shows my external monitor