Flickering followed by black screen and beep sounds.

[Mohsin51]

Sir, on 16th April when i power off the system, there was only one option update and power off. I did the same. Then after few hours, when i started to work, suddenly screen flickering occurred, then black screen and beep sound followed. I tried all techniques on internet. But didn't succeed. I went into diagnostic, externsive system test. It passed. However somehow it started. Then i reset the pc also. But the problem continued, screen got black, then sometimes pc started, i worked on it.then a new problem of "windows license expire soon came". I tried all the thing on net. Although i had activated Windows. Yesterday, i also did clean install. But same warning continues. And now after 3 days, it screen black again with beep sounds. Meanwhile i also tried to upgrade BIOS via f2 key... But bios upgrade failed. And roll back option was also greyed. I also tried to update display driver when it was working. But now i have black screen with beep sounds at an interval of 30 sec. Power led on for 30 sec, then 5 sec off

[Lil_Boy_Blue]

Hi

Hope this helps...

https://support.hp.com/us-en/document/bph07107

[Mohsin51]

No sir, it didn't helped me out. I had no red led, there is only white LED. it is on for 30 sec, then 5 sec, it remains off... What to do now. There is nothing on display. 

[Lil_Boy_Blue · Accepted solution]

Hi
First:- Turn off the computer, press and hold the PWR button for 4 seconds.

Then - Leave only keyboard and mouse connected, disconnect all externally connected
devices such as Docking Station, USB storage devices, displays, and printers.
Unplug the AC adapter from the computer.

Next - Press and Hold the Power button for 15 seconds to Hard Reset.
Rinse and Repeat

AND/OR - Power on your PC, press Esc (repeatedly), then F2 at the prompt.
Choose System Tests (Fast Test does a 4 minute hardware check).
AND/OR
HOW DO I USE DIAGNOSTICS?

HP PC Hardware Diagnostics Windows is a Windows-based utility that allows you to run diagnostic tests to determine if the computer hardware is functioning properly. The tool runs within the Windows operating system in order to diagnose hardware failures. HP PC Hardware Diagnostics Windows comes pre-installed on new HP computers, but if not on yours, download here:

http://ftp.hp.com/pub/softpaq/sp93001-93500/sp93457.exe

AND/OR - Windows Logo key + Ctrl + Shift + B
(This key sequence actually restarts you graphics driver (W10 only).)

AND/OR - If you’re using multiple displays, try projecting video to a different monitor.
Press the Windows Logo key + P, select a display, and then press Enter.

[Mohsin51]

Thank u sir, i did all the steps suggested by you but unfortunately didn't succeed. Finally i opened up my pc, and clean hard drive and RAM by soft cloth, and my laptop is powered on then, with no issues.

[Lil_Boy_Blue]

Prego.