Re: Works on external monitor, but not on internal
I think you must to change your LCD SCREEN or you use a crt display.Your motherboard is ok. I've another problem, it's a video display. in Dos mode i have a half of screen and i can't use my laptop under Windows but it's work fine with Linux. I'd like to know if you have the bios for this laptop, i'm looking for this for a long time ! (not found on hp web site). If yes please can you send it to me at this email: firstname.lastname@example.org. Many Thanks,
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Check the display settings on your laptop to see if the external monitor output is disabled. There is usually a function key on the keyboard with a picture of a monitor on it which can be used to switch between internal & external monitors. You may also need to try on another monitor/TV or change the HDMI lead.
This absolutely could be the ribbon cable connecting your screen to your motherboard. If you know how to check this, it would be worth trying before spending $150+ on an LCD. Any way you look at it, this is definitely a hardware issue. Just hope it's not the motherboard's onboard video card. Here is a modified answer I gave to a question similar to your issue:
If you turn on your laptop and the display is bad, your issue is with either the LCD screen or the motherboard (since the video card is built-in the motherboard). This will be easy to diagnose. 1.) Plug an external monitor (one which you know works) into the VGA port of your laptop. 2.) Turn on the laptop. 3.) Hold down the FN key (lower-left corner of the keyboard) and press the "CRT/LCD" key (it will be located on the number keys or F1-F12. You do this to tell the laptop that it needs to send the video signal to the external monitor instead of its built-in LCD screen. If the display is good on the external monitor, then the issue is with the laptop's LCD screen (about $200 for the part plus labor to install). If the display is still messed up on the external monitor, then your problem is with the motherboard ($300-$500 for the part plus a lot in labor cost for installation). Let me know if this helps you!
Tryconnecting an external monitor to the laptop. You may have to select the videooutput to display on the external monitor by holding down the blue key and pressing the blue CRT/LCD (located on one of the keys, likeF8,F9, etc..). If the problem occurs on the external monitor with the batteryor AC power, then you have a problem with either the video card or motherboardin the laptop. If the problem does not happen using the external monitor thenyou laptop's LCD display is going bad.
Have you tried pressing and holding the "Fn" key and then, while still holding the "Fn" key, press the "F4" key? This toggles between the internal and external displays. There are three settings. The internal LCD only, both internal and external displays at the same time and external display only.
You can update graphics driver, if that does not fix the issue check the display on external monitor. If the external monitor works fine you can isolate checking the display in BIOS Setup scree (Restart your computer and keep tapping F10 to getinto BIOS). If the same issue in BIOS, you may have to change display of the unit.
Please try to connect the monitor to another PC, if it continues to happen, then probably an internal electronic part/s of your monitor is cold soldered / defective which failed to send signal to other hardware parts of your monitor thus you only see white display. I suggest to bring the unit to an authorized service center fix / replace the cold soldered / defective part/s. regards
If you are hooked up the the external monitor and/or TV and can see the desktop, you can probably reselect the internal display via software from Display Properties.
In most cases you can change from the external display to the internal and vice versa by holding down the blue Fn key, and hitting the proper number on the keyboard. The correct key has a blue icon meant to resemble a monitor on it.
This is if the repair/replacment of the internal screen was done correctly and the screen is actually working. If the screen is not actually working, though, this will not help you.