Why after sometime My Laptop showing me No Bootable Device Found?

That almost always means the SSD is on the way out :-(. HP uses drives that IMO leave something to be desired due to speed and lifetime shortcomings (I'd pull my 640 G9 out to show you what mine shipped with so you know how bad some are, but I put old thermal paste on it and yeah, the paste I had on hand is shot - I need to buy fresh paste). Buy a replacement SSD yesterday, before the drive completely fails.

These drives are fine but they’re kind of mediocre with a lower than average TBW (my other 640 has 4% wear in 2 years! Same drive!!!) and HP loves them like Dell loves Seagate spinning drives:

Once you replace it, I would reinstall Windows from scratch and write the image to a USB drive. Use the image from the Microsoft site: https://www.microsoft.com/en-us/software... -- you can either download the ISO and write it using Rufus (which would be my suggestion so you can disable the M$ account bullshit and do a local account) using this guide. You can do it with the OOBEBYPASS method on some images, but it's on borrowed time :-(. I downloaded the last 24H2 image before it was announced for ARM and x64, and I saved it. I'd suggest doing the same if it works and you don't use Rufus.

The service manual can be found here: https://h10032.www1.hp.com/ctg/Manual/c0...