External monitor works but main is not recognised
Hi, i have an ASUS TUF Gaming FX505DT and today i was working as normal and the main display, the one with the laptop stopped showing image. I opened the case and gave it a cleaning and tested the RAM sticks, even discharged all static by pressing the power button 30 seconds while the battery was disconnected but still nothing shows in the main display. The external monitor works perfectly and when i go to device manager it only shows the external one but not the main one.
It's not an update problem because i didn't get an update and the graphic drivers are updated. I can't go into BIOS because for some reason it only works with the main display.
I don't know what happened and i really need the two displays and if any of you can help me i would appreciate infinitely. Sorry for bad English, it's not my first language.