Black Screen

[Ammar16]

HP pavilion dv5 windows vista shows black screen after starting. Caps lock and scroll button show one blink only at the start. HP logo remains for one second and screen goes dark. However, when it is about to ask password, the screen looks grey for 3 seconds and gets dark again. After half and hour, when I touch the mouse the screen looks perfect for one second and again gets dark. If I use torch, I can see dim desktop. Functions are all OK. Can you please help me restore my screen?

[praveenbv]

Hi@Ammar16,

Welcome to the HP Support Community!

We reviewed your post and I understand that the  Notebook is not Powering ON,

Don’t worry, I assure you I will try my best to get this sorted.

I recommend you follow the below steps and check if it helps

Do you see a light at the place where the charger connects to the laptop? If yes then it indicates that the charger is all fine.

I recommend you to perform the following steps to isolate the issue and arrive at a fix: 

• Remove the battery out. If the battery is integrated and does not have a latch to release it then leave the battery inside the laptop.
• Disconnected AC adapter from the laptop.
• Press and hold the power button for 15 seconds.
• Reconnect the battery and plug the AC adapter.

F6 + Power Button

• CMOS Rest ( combination of windows button and letter 'V' then push the power button ones and release the windows and letter 'V' after 5sec

If the laptop does not power on then please continue with the below steps:

• Disconnect the charger and remove the battery out.
• Connect only the battery and check if the laptop powers on.
• Likewise, remove the battery out (if removal battery ) and connect only the charger and check if that helps.

Hope this helps! Keep me posted.

Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

Have a great day

[PAWebb]

I have the same problem with an EliteBook 8440p.  PLEASE NOTE  The suggested solutions address the Notebook not Powering ON, but Ammar16 describes the system powering up, remaining powered, but the display comes and goes.  This also describes my problem.

In addition, in my case, if ambient light is from a certain angle, I can see a faint image appearing on the laptop display.  A connected external monitor displays perfectly well and I can get work done.  So, the problem appears to have something to do with the backlighting sub-system.  How do I chase down the root cause?  (If required, I have no problem with disassembling the computer and troubleshooting at PCB level.)