[Silverhazesurfer]

I would think that the first major part to look at would be memory. See if you can get your hands on a replacement module for testing. It could be failing and causing the issue. You could also try reseating it.

I had a friend bring me a laptop that wouldn't boot. Similar situation. No POST, nothing. He sat on it. I expected the worst but the screen wasn't broken or anything. Figuring he broke something inside, I tore into it. Nothing was broken or damaged, that I could see. So I proceeded to remove all parts and connections and put it back together. Upon power up, it worked fine. He's been using it ever since. Figured it may help.