Apex Legends Stuttering (Unplayable Game)

Unfortunately I do not have any spare parts or the money to change over parts to see if that would work. But I have been over every single part to make sure they are all working properly and they are performing very well. I sat down with someone who works with building/fixing computers and ran multiple programs stress testing and working every part to see if any parts were faulty and it all came back telling us that nothing is wrong. 

I have had all programs stopped on start up plus turned all lighting off and that hasn't worked at all.

Cooling is sitting at really low temps while running highly demanding games/programs so its not that either.

All games are installed on the SSD, only put stuff like documents and pictures/videos on my HDD.

I haven't pulled any ram sticks out because I do not know how to take it out let alone put them back in. Or know which slots certain ones go back in. (Not a computer tech person)