Question about HP ProBook 4310s Notebook

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My laptop powers up but the screen is blank. I attached it to an external monitor and it proved that the laptop is functioning with an external screen. Is there a solution to this problem? TB

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1. Test using an external monitor. If it works, then either the screen bulb or the inverter board might be defective.
2. Test the inverter. Easiest way to do it if you have a good screen with a good bulb. Connect the good screen to the inverter board & test it. If it lights up, then the inverter board is good. If it did not, then the inverter board is bad & needs to be replaced.
3. If the inverter board is good, then we are left with the possibility that the screen bulb is bad. To fix this, we will need to replace the LCD screen.

Posted on Oct 09, 2010

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Posted on Jan 02, 2017

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1 Answer

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Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.

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1 Answer

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Did the laptop boot up all the way except the screen is blank? Do you hear fans running and the hard drive spinning, lights on? If you think it booted except the screen is blank try the steps below.

Shine a flashlight on the dark screen to see if you barely see the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If so that proves your video card is ok. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works, then your screen is bad. If you see no icons by shinning the flash light and nothing shows on the external monitor, then most likely your video card is bad.

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1 Answer

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1 Answer

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So does it sound like your laptop is running and booted up all the way except the screen is blank? if so try the steps below:

Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.

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1 Answer

Screen is blank (no video), even when connected to to an external monitor. I presume at this point that it's a problem with the on-board graphics processor. Notebook appears to power-up normally. Notebook...


will video work when first booting?? try to start in safe mode then if you have restore disk or applications disk remove the display video in hardware manager, sometimes the drivers get corrupted, thei may re-install video drivers. al so you might go into bios and check for setup defaults hope this works. have had similar situations on diffirerent systems. some laptops have a Fn key Function key so when you have external monitor up to system it switched=s from laptop monitor to external little picture on keys usually on or near function keys.

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1 Answer

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I beleave you may need to press the function key as well as the F-4 key to bring up an external monitor.
Try holding down the Function key and tapping the F-4 key while watching the screen on the external monitor.
Is your unit within warranty, HP offer an extended 1 year on top of your normal 1 year warranty for video and motherboard issues.
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2 Answers

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My best guess is that it's the screen or the screen sensor try playing with the angle of the screen. If it displays at a particular angle its the sensor if not its the screen, or motherboard. Either way if you pay Dell to fix it, it's like buying a new laptop.

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1 Blank - absolutly or 2 stuff on the screen but dim and unlit? 1. - tube or inverter gone - workshop job 2 Ditto

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