@Munia_Akhter Welcome to HP Community!
I understand that you are getting a black screen.
Please perform the hard reset and check.
Hard Reset:
1) Shutdown the computer.
2) Unplug all the Adapter and peripherals connected.
3) Remove the Battery. ( not for Built-in Battery computer )
4) Press and hold down the power button for 15 to 20 seconds.
5) Plug-in the Adapter and put the Battery back into the computer if it's a (removable battery)
6) Try to turn on the computer and check.
Specific patterns of long and short blinks along with long and short beeps (where applicable) identify errors during the startup process. Newer computers have two-part blink sequences with different color lights to indicate specific errors. The LED blink/beep sequence near Caps Lock and Number Lock keys indicates the type of error:
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The red Caps Lock LED blinks are long.
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The white Caps Lock LED blinks are short. For example, ‘3.5’ indicates 3 long red blinks and 5 short white blinks.
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On systems that do not have a dual-color LED, both long and short blinks are white.
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Some systems do not have a speaker and do not beep.
Note the blinking sequence and use the chart to identify the error condition. Then use the troubleshooting steps to solve the issue.
Please refer to the below link.
https://support.hp.com/in-en/document/c01732674
If the issue still persists, please contact our phone support and check for the support option. They will help you.
Or you can contact the local service center for repair.
Here is how you can get in touch with phone support.
1)Click on this link - www.hp.com/contacthp/
2)Select the product type.
3)Enter the serial number of your device or select let HP detect your product option.
4)Select the country from the drop-down.
5)You should see the HP phone support number or Chat option listed.
We are experiencing longer than expected wait times to reach an agent due to the CoViD-19 impact and there might have been issues in you getting the expected resolution on the issue.
Keep us posted,
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Give us a virtual high-five by clicking the 'Thumbs Up' icon below, followed by clicking on the "Accept as solution" on this post,
Have a great day!
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