Cannot switch back main display after connecting HDMI

Hi all,

I connected my HP Pavilion dv4-2165dx to my TV via the HDMI slot, and worked perfectly. I disconnected the cable from the notebook when I was done and still got the main LCD display to work. When I restarted the system, the LCD display was gone, just a blank screen with a backlight. The system is booting correctly, I can hear the windows7 startup sounds and even type my password in and access my account. So far I know that:

1. The screen hardware is not damaged, because after some reboots and taking the battery off for an hour I could get the input back with no problem (with windows complaining about being unable to boot and suggesting me to run Startup repair), but got a black screen again after rebooting again.

2. I can connect the HDMI again and get the output on the TV screen, but no main display is detected. If I toggle between displays with fn+f4, only the external HDMI-TV display works.

3. I get no startup screen either. That is, not even the first screen from where I can access the BIOS. But if I connect the HDMI-TV from the beginning I get all that info on the TV.

4. I reinstalled the Graphics driver from HP with no change.

My guess is that somewhat I messed up the default configuration and that the system is only recognizing the external displays as default displays. I haven't been able to modify this from the Control Panel - Display Settings menu, and I don't know where in the registry this default startup options could be.

Any help?

thanks!

did you uninstall the old drivers before installing the new one's ?
also you may try going to Control Panel\device manager\ display adapter and deleting the drivers from there then
reboot and install the new one's..

scrooge

Hi!

@scrooge: I did uninstall the old drivers first.

@Britton30: I can access my account with the TV display connected, and when it is not, I can hear the "login" sound after typing my account.

I got my screen back after some reboots and that's where I could see the Startup Repair. Indeed it didn't boot and got stuck. I rebooted and got the black screen again. I got that very same screen again and I chose to start windows normally and it booted as if nothing had happened. No other display was selected except the MobilePC main display. I restarted and got the black screen again.

The display is correctly identified as 2, but no other display is detected. And if I chose Display 1, I lose the TV display as expected but nothing comes on my screen.

Thanks for merging the posts! I couldn't find how to delete the other.

i think after you changed from display 2 to display 1 you need to unplug the hdmi so you can see your display on #1.
try it and see if that helps..

scrooge