So i turn on my pc lights come up for 1 second the next second it shutdown instantly so i tried to fix it with my friend for about an hour all we found out was that the computer would only stay on if ram stick wasn’t connected and i was like k , ill just give it back to warranty and they’ll try to fix it, next day i bring it and he checks my pc out, he says everything is ok pc was just very dusty, upgraded cpu cooler for future if i want to upgrade, bring it back home works for a little while and shuts down im like ok don’t hit me with those flashbacks, too early, turn it back on stays on for about 20 mins and shuts down again i switch power chord holds for another 20 mins and now shuts down right away whenever i try to turn it on. What do i do? Help.