So I have my 2x8 ddr4 ram from before I upgraded my PC (components), and when I turned on pc it wasn't booting up. So then I removed one ram from the first slot and it worked but then I only had 8 ram not 16. Then I bought 1 stick of 16 ram and I thought maybe the ram was broken and I put the new ram in the first slot and pc wasn't booting up as well. Till now I have it in second slot. Today I watched what to do if it's not working and saw some posts to spray/blow the dust out. I tried doing that and still doesn't work. So what am I supposed to do now? New mobo supposedly? I have 7th gen i7 and I can't get brand new mobo's in my country in stores. Is it worth buying from ebay/used?