With dual monitors, sometimes the secondary monitor becomes monitor #1 instead of staying monitor #2, and no amount of telling my laptop that its OWN monitor is the primary monitor seems to switch it BACK to being monitor #2. Even if it is the primary monitor, it stays numbered as 2...and this causes all KINDS of problems. How do I force it BACK to being numbered #1? And STAY that way?

SOURCE: Dual monitor problem

Change the monitor properties from clone to dualview

SOURCE: Data Shows up only on External Monitor, not on Laptop Screen

Hi,

Since the laptop works on the external monitor, then it would be safe to assume that it is only the L:CD display part that is the issue. Often LCD display (of laptops) are working but only that you can see the actual display. One way to verify is to shine a flashlight at an oblique angle to the screen, semblance or part of the desktop could be seen. If the desktop could be seen (albeit very very dark background) then it could either be the CCF Lamps (cold cathode florescent) or the inverter that powers the lamps.

Often, the defective component would be the inverter. It is relatively easy to replace the inverted. It is sometimes more difficult and challenging cracking open the casing of the display panel of the laptop than replacing the inverter. Additionally, inverters are readily available online. It is also not surprising that inverters for other brands/models would also be used in your Toshiba.

This would be a good place to start for inverter boards. This is a nice tutorial if you are considering a DIY.

In some worst case scenario, it could be the video interface or even a loose/open flat cable from the laptop's main body towards the LCD display panel.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

SOURCE: hp dv9000 monitor issues

The Black Screen of death...

you gotta replace your mobo(200$), or reflow the gpu(20$)

SOURCE: Using notebook display and external

First make sure Primary display driver installed and working properly.Make sure it's screen resolution is 1024*768. If still same then uninstall primary display adapter driver then reinstall. then it will work fine. Let me know if you need further assistance. Thanks for using FixYa.