Notebook Hardware and Upgrade Questions

So my dad gave me this laptop a month ago and have been using it for schoolwork and gaming. Several weeks ago, this laptop suddenly had an HDD failure(it was getting old) and had to get a replacement.

Everything worked fine again, until 2 weeks ago, my laptop suddenly died. No BIOS, No Screen Display, nothing. I see the caps lock key beeping once and checked around online and found out it's apparently a motherboard problem?

I tried every solution online :

• Removed AC Adapter and Battery and pressed power button for 15 seconds
• Removed Memory Modules, cleaning, rearranging them
• Removed CMOS Battery and did another reset, pressing power button for 15 seconds
• Disconnected all components, speakers, trackpad, HDD, only keyboard, fan, and motherboard itself were the only connected ones to power on.
• Removing the entire motherboard, cleaning it, and rearranging everything again

All of these bore fruitless results. The fan powers on then off and the caps lock still beeps once. Is this issue related with the fan itself? Or is it motherboard related?

The only method I haven't tried yet is this thing I found online about BIOS programming chip because the problem could be the BIOS and considering that this laptop was well used since 2016-ish, I think the components might have just gave their last breaths this time around.

I'm still an inexperienced person when it comes to things like this so I might have did something wrong or I may be saying incorrect terms so apologies, and I was hoping I could get an alternative solution here that I could do to fix it before we spend money to get this fixed at the repair shop again..

Any help would be great

Thanks