HD4600 HDMI inbuilt display stopped working

[themaskofwraith]

Hi,

My laptop info
screen resolution is 1920X1080.
Hd4600/i7-4720hq
Clover boot loader


Today at work I had to connect external display through HDMI. And it worked just fine. But when I connected it second time system rebooted.

So I started the computer with HDMI cable connected , instead of apple logo I got old CRT monitor input error in the secondary display. But the login screen appeared normally and graphics acceleration is also working fine.

Now the problem is after disconnecting HDMI cable the display didn't switch back to inbuilt display.
So rebooted hoping that inbuilt display will work, but after apple logo the display goes blank , tried connecting HDMI cable but the secondary display also not getting signal.

In short after the apple logo both inbuilt and external displays are not getting any signal.

Thanks

 

[themaskofwraith]

I ended up reinstalling OS again

Thanks