my predator 300 from 2018 is around i dunno 7 years old and has a lot of problems first the screen is black not even on working on that by trying ctrl shift b and the laptop turns off around 5 seconds after turned on i am wondering what i could do to fix it back to what it was 5 years ago btw i have not modded the laptop also i am a novice tech person in my early teens
Is your laptop is the Predator Helios 300 PH315-51 which is a 2018 model, and you haven't replaced the main battery, it needs a new battery first, secondly, change the RTC/BIOS battery also as it need a new one of those too but after you disconnect this battery shot its mainboard plug + & - pins with a metal screwdriver to reset the CMOS also. Do this first as this is the reason why you laptop is turning off after 3 seconds, as after doing all the above your laptop will boot.
if and after you have done all the above and all that doesn't fix your laptop, then take it to a technician as your laptops main power rain is faulty or its EC chip needs replacing and reprograming which you cant do yourself. Good luck and hope this helps you out.
Acer tested batteries for the PH315-51
Take the RTC/BIOS battery out and at its mainboard plug short its + & - pins to reset CMOS before you replace this battery.
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You could also try a battery reset, disconnect from mains, press Power button for 9 Secs, release the button and leave the laptop to rest for 10 Mins, press Power button to start normally and see whether it fixes the problem.
also i tried ctrl shift b it does not work at current state because of the boot loop problem i will add another comment with the model name at a later date also when power button is pressed the keyboard lights up the fans wirr for about a second then the fans stop spinning and after the 10 seconds are up the board makes a light chirp also if i unplug the computer while the computers on it turns off i have also tryed battery reseting by pressing and holding a paperclip into the battery reset pinhole still nothing
