Stuck In Boot Loop (Lights & Keyboard On, No Boot)

I was in the middle of working on my computer, and it suddenly shut off. No amount of power button pressing or charging would get even the slightest light flicker. From there, I did the following (not necessarily in order, and most multiple times):

•Held power button for 60s with every combination of power and battery connected/disconnected • Reseated SSD and RAM • Unplugged battery and waited for 1+ hr • Let charge for 1+ hr

Now I've gotten to a point where the lights turn on, but it doesn't boot and shuts off shortly after. Sometimes it makes it to the ROG logo, and ONCE it made it to the windows login screen, but that's pretty rare and it always shuts down very soon after anyways. Has anyone had this issue in the past, and if so, did you fix it? I need my laptop for school, and really can't spend the time or money to fix it / buy a new one.

Thanks!

Video Link: https://imgur.com/a/ZaP3LBY

Update: It's fixed! I took it to a computer repair shop, and they were able to inspect and fix it within a few days. They said they took it fully apart, and there was a loose power cable. They also redid the thermal paste, and cleaned out the fans & other parts. All together it cost £50, which is SOOO much better than having to replace the full thing. If anyone has this issue in the future, go to a repair shop with good, trustworthy reviews, and hopefully they can fix yours like they did mine!