Laptop randomly stops working and then starts working again

So my laptop stops working suddenly and then randomly starts working after 15-20 days for about 2-3 months. This has happened to me 3 times now. No lights come on in the system, I cannot enter BIOS mode, I tried to drain the residual battery and turn it on again it didn't work.The laptop has a non removable battery so can't really take that out. I took the laptop to the HP service center as well, they kept the laptop for a month and then told me that there's absolutely nothing wrong with the laptop. This is a very annoying issue. I would really appreciate it if somebody could help me out.

PS: I'm currently in the stage where the laptop is not working

shivenkapur said:

I took the laptop to the HP service center as well, they kept the laptop for a month and then told me that there's absolutely nothing wrong with the laptop....

PS: I'm currently in the stage where the laptop is not working

This would be a very good time to go back to the HP service center and say "If there's absolutely nothing wrong, then how do you explain this?"

and also dont tell them it will / might work again after a month or they might keep it for that time

What were the steps that you made to enter the bios?

Power on and repetitively click the F2 key > what menu do you see?
Power on and repetitively click the F10 key > what menu do you see?

Have you tried an in place upgrade repair with a windows 10 iso?

In case you cannot get into the bios have you tried or the HP service center used a HP UEFI USB drive?
HP PC Hardware Diagnostics | HP® Official Site

Why use UEFI Diagnostics? | HP® Official Site

HP Notebook PCs - Testing for Hardware Failures (Windows 10, 8) | HP® Customer Support

If you are able to enter the bios with either repetitively clicking F2 or F10 then run the UEFI diagnostic tests in extensive or loop until failure mode.

Bootable windows 10 iso: Download Windows 10

On HP computers repetitively click the F9 key then select external bootable drive to use the bootable windows 10 iso.

Repair Install Windows 10 with an In-place Upgrade Windows 10 Installation Upgrade Tutorials

Please upgrade the specs on your computer:
How To Fill Out Your System Specs

How To Fill Out Your System Specs

System Specs - Fill in at Ten Forums: System Specs - Fill in at Ten Forums Windows 10 General Tips Tutorials

In the left corner below in your post you find 'My System Specs'.

After clicking it you can find a link a little below that says 'Update your System Spec', click on this link to get to the page where you can fill in your system specs.

System Info - See Your System Specs - Windows 7 Help Forums