Inspiron 15 7559, is it time to give it up?

I have a dell Inspiron 15 7559 had it running for like 8-9 yrs. Last week i was using it like normal watching a youtube video and it turned off on me out of nowhere which has never happened before.

I turned it back on and an orange red box popped up saying "invalid signature detected. Check secure boot policy in setup"

The laptop has done a hardware scan and said there are no issues but also "no bootable devices were found! Possible causes could be corrupt os image or a bootable device is not enabled in BIOS setup"

So i googled it and read on some forums to turn off secure boot, but it didnt work and it stated saying "the operating system couldn't be loaded because a critical system driver is missing or contains errors" or "the boot configuration data file is missing some required information"

So from there i tried a bunch of different things to somehow get it to load the os which eventually led me to make a bootable usb to try and fresh install windows 10 but for some reason from the fast boot menu it wouldnt boot in UEFI but it would load in legacy. So in legacy mode i go through the start of the setup i select that i don't have a product key cuz i can't remember it hoping when ive installed windows 10 it would read the product key of the system, i select windows 10 home then next after that it give me a text box saying "windows cannot open the required files"

The os was originally on hdd which i moved to ssd buy cloning it or migration cant remember 

Do i just give up on trying to save this laptop? Tried as much as i could to save it

Bought in 2016

Core i5

16 GB RAM

GeForce GTX960M