Motherboard LED lights up but PC won't start

[bojjan]

Hi!

So I decided to put together my old pc again to use as my backup. But once I pushed the power button nothing happened, nothing at all. So my first thought was that I had plugged the power switch incorrectly into the motherboard, so I checked and that wasn't it. Then I checked if any of the motherboards LED's got any power, and they do. I'm completely stumped, please help.

Specs :

CPU: i5 6600k 3,5ghz
PSU: Corsair CX500
Motherboard: Asus P8Z77-v lx
RAM: Corsair Dominator 16gb
OS: Win10

 

[Kasper Jorgensen]

Are the 24 pin ATX and the 4/8 pin CPU power connector mounted and seated correctly?
Try to mount your system outside the case to check if it is just something as simple as a short.
Also, that is a very crappy PSU you have there.

 

[scout_03]

did you try to start the system by touching momentary the 2 power pins on the board and unplug front panel switch for this test to see if system will boot .

 

[bojjan]

Are the 24 pin ATX and the 4/8 pin CPU power connector mounted and seated correctly?
Try to mount your system outside the case to check if it is just something as simple as a short.
Also, that is a very crappy PSU you have there.

Yes, both are connected correctly, there is no way for them to come out without manually pressing down on the hooks.
I know, it's my old pc so the parts are quite outdated and weak.

 

[Kasper Jorgensen]

Are you using onboard graphics or a discrete GPU?

 

[bojjan]

Are you using onboard graphics or a discrete GPU?

I'm using a GTX 660, I forgot to put that into my specs, sorry. I don't know what a discrete GPU is, so I don't know if I have one or not.

The driver's for the gpu is already installed since I was using that exact setup before I retired the pc, so everything is the same in the computer except for new cooling paste on the CPU.

 

[scout_03]

on repaste you might have put to much and it spill on cpu base or around also your fan is plug in and you did not bent any pins on the repaste if you remove the cpu these need to be check .

 

[bojjan]

It seems like removing the CPU from the motherboard and installing it back in fixed the problem.
Thanks for all the help!

 

[scout_03]

it might only be miss aling or the lock was not fully on at least it work .