crwdns2934241:0crwdne2934241:0 Majesty
crwdns2934249:0crwdne2934249:0:
Being that it works perfectly in an external monitor u can pretty much rule out the motherboard. I would first try to replace the inverter, if that doesn't work, then your display might need to be replaced.
crwdns2915684:0crwdne2915684:0:
open