I have a 2 1/2 year old Nitro AN15-44-R99Q laptop that is out of warranty that suddenly quick booting.  I can hear the fan running but it isn't going through the boot sequence at all. It worked without issue this morning as I ran it on battery until it game me the power low warning  a few hours later.  I shut it down properly as I always. do.   Tonight when powering on the key board lights and I can hear the fans running but no other sounds as the screen remains dark.   I went to the repair services page and entered my Serial Number and the code and it didn't recognize it. I type in the same exact serial number on my registration page and it is the correct serial number.  Same thing with the snid number.  How do I get repair service when it doesn't recognize serial or SNID number?
[Edited the thread to add model name to the title]