Motherboard doesn't post

[verymadhero]

So, lately weird things started happening with my PC. I was getting errors in BIOS like "memory decrease" and other stuff which I don't really remember. My PC would restart once or twice for no reason but no BSOD. Whenever I tried to turn off the PC it would turn on again, so i was leaving the Power Supply turned off for 3 days so PC wouldn't turn on. Yesterday my PC did not respond to "power" button, so i took a look inside. I've noticed that 2 pins from the 24 pin plug were flooded with something and it SEEMED like there was a short (I'm not sure). So I cleaned the contacts but that did not help.

What I noticed and did to troubleshoot this was:

I've noticed that LED next to the 24 pin called STANDBY is ON like its supposed to be after connecting power 24 pin.

I still checked the Power Supply with a tester. Voltages are OK, I checked it with a working PC as well.

Graphic card has 2 LED which are supposed to flash RED OR WHITE but they are off.

I tried to turn it on without the GPU and 1 stick of ram with nothing else connected but that did not work.

CPU was checked on working PC and it's OK as well.

I also tried turning on the PC with a jumper.

I wanted to know if power gets to other places on the motherboard, so I was checking the voltage on the CMOS battery when pressing the POWER ON button and voltage was going down whenever I pressed the button.

 

What do I check next? Is it dead?

 

Peripherals:

i5-2400 CPU

GTX 1060 3GB GPU

4x 2GB DDR3 1333mHz RAM

DQ67SW Intel Motherboard

and some old 500 WATT PSU