Sometimes the PC wont boot (possible RAM problems) - Hardware & Software

Hello guys, I'll do my best to explain the problem I'm having with my PC. It is a custom built PC I bought last May, it worked fine until about a week ago. These are the main specs: -i5 3570k 4Ghz -Asus p8z77-v PRO -Corsair Vengeance 8GB (2x4gb) 1600 C8R 8-8-8-24 -EVGA GTX 670 SC -Crucial m4 128GB SSD -Corsair AX650 Now to the problem: One day about a week ago I wanted to turn on the PC but pressing the Power button wouldn't do anything..... I kept pressing it and nothing would happen, so I took out the side panel of the case (FRACTAL DEFINE R4) and the green power led on the mobo was turned on like normal and nothing would happend while pressing the power button. After switching off the powersupply and unplugging the cable from the wall and trying again a few times after a while it finally booted and everything worked normally... In the evening I turned it off normally and the next day it booted at the first press of the power button. After 2 days it did that again but this time it wouldn't start at all even if I unplugged everything etc...... So I tought it may be the ram, I took the two modules out, tried one by one and not one of them would work, then I replugged them both back in and the PC turned on (????) Then after turning it off it wouldnt turn on again, so I took the ram out again, tried one by one and this time only one of the two modules would work.... After a while playing a game I started to notice the performance difference playing with only 1 module, so I tried again, put the other module back in and the PC started just fine and kept starting for another few days... Today again it didn't want to boot, so I did the whole thing again, tried swapping the modules, using them one by one and nothing worked, so I unplugged it from the wall and let it be for a few hours..... Now I tried again and after some time swapping the ram around and retrying I managed to boot with 1 of the two sticks...... I'll try now to turn it off, put the other stick in and try to boot again, hoping it would turn on.... (It's not a faulty case power button since I tried shorting the two power pins on the mobo and some times it worked and some other times not..... What can be the cause for this? The Ram, the mobo?

Double (or triple!) check that the front panel connectors are plugged into the motherboard securely, and do the same for all power connectors. Bad RAM probably isn't going to make your PC not boot, it usually just causes crashes and corruptions. Sounds like a possible faulty PSU or motherboard, but it's too early to know what the issue is without some more trial and error.

Most likely it is your PSU, do you have a spare anywhere you can try and test out? And holy fuck AugustBurnsRed, that avatar is creepy as fuck.

The PSU is a brand new Corsair AX650 Gold...... Seems strange to me that such a good piece already burns out...

It could be faulty, if you rule out the PSU not being the problem, most likely you have a faulty motherboard :(

Try removing the hard drive, RAM, CMOS battery and your optical drives. TRY to power the system up. When it does anything, shut it down again. Reseat the CMOS battery, power up, shut down, reconnect your hard drive, power up, shut down, and so on. Not sure if this method works on this problem, but we'll see so.