So i have had my pc for about 2 months and it was working fine till two days ago. saturday morning i woke up and tried to turn on my pc on but it didn't turn on so i opened up my case and started to see if i could find out what was wrong. I noticed that their was a light on the motherboard when my power supply was but not when i turned it off. this made me think that the power supply was not broke but maybe the motherboard. Any help is good help
Popping out the battery is usually the easiest for a bios reset. Most likely around the primary pci slot used for gpu. It looks like a quarter. Put the battery back in before you power up again.
Even though there is a light on your mobo so there is some sort of power being delivered, I'd swap the PSU first and see if that solves the problem. If that doesn't work, it's most likely the motherboard.
Remove battery 30secs, then put back in. Try to boot.
Strip pc down to a barebone setup outside of the case - just psu, mb, cpu, 1x stick of ram (rotate between all the dimms). Run your display off the motherboard igpu output. To boot short the 2 pwr pins on the front io section.
Borrow what parts you can to swap out with your parts so you can go through a process of elimination to find the culprit. If you get it to boot sweet.
Worst case, take into a store and get a honest diagnosis so you can rma what ever needs to be replaced.
I had this happen once, turns out it was a bad connection. You can pull out everything and turn it on and just move up from there. Add another stick of RAM, works? Add the GPU, works? Add another thing, etc.
This smells of a bad PSU. A friend of mine had a similar problem where his PC would not make any action even with diagnostic lights on the motherboard being on. Swapped the PSU and everything was hunky dory.