Motherboard failure?? Help pls

[WanderingFoe]

Hello. 
Im working on my first build and currently just trying to have it work as a test bench like setup with only cpu, cpu cooler 2x8 ram sticks and cpu 4+4 and 24 pin power connected, cpu fan into cpu fan #1. I’m using an evga z370 motherboard and I tried using an intel celeron g4900 just to get it to boot. I got a post code 53, memory initialization failed, no usable memory. I tried switching the ram slots from 2,4 to just 2 then 4 and 1,3. I went from g skill ripjaws V to Corsair vengeance rgb pro to g skill trident ram. I tried putting in an intel i5 9600k, I know it needs a bios update, but I get the same post code every time. I’m not sure what else to try, the only thing I haven’t switched was the motherboard. I’ve looked at the cpu pins and they all look fine. I can post pictures if needed. 
 

im just not sure where to go now, do I need a new motherboard or am I missing something? Help is greatly appreciated. Also, sorry this is so long, I just wanted to be thorough with what I’ve done

[BlueChinchillaEatingDorito]

41 minutes ago, WanderingFoe said:

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Have you tried with single sticks by any chance? Also clean out the RAM slots and the modules themselves with some Deoxit (better) or isopropyl alcohol (when the board is unplugged of course). Not sure how long that board has been sitting around so there could be some contaminants in the slot affecting the connection. 

[WanderingFoe]

1 hour ago, BlueChinchillaEatingDorito said:

Have you tried with single sticks by any chance? Also clean out the RAM slots and the modules themselves with some Deoxit (better) or isopropyl alcohol (when the board is unplugged of course). Not sure how long that board has been sitting around so there could be some contaminants in the slot affecting the connection. 

I’ve had it awhile but it sat sealed in original box. I’ve tried every combo with ram slots except mixing ram brand/types like Corsair vengeance with ripjaws V or should I? I’ll try cleaning out the slots and see what happens