I have a HP EliteBook 745 G2 laptop with Windows 10 64bits, the display card is AMD Radeon(TM) R6 Graphics. My displayport is not working. I have a Dell monitor connected using a displayport/VGA cable and another Dell using the standard VGA connection. I got no signal in the displayport monitor. When the computer boots up there is no problem, both screens work fine but when windows takes over then the displayport monitor turns off. I tried booting windows in safe mode and both screens work. I have all the drivers up-to-date. Any help would be appreciated.
Attached the dxdiag file for further info.