My mother board in good condition both ram slots working 5 days ago I used 2+2 gb ram , after day I cleaned my motherboard I don't touched my ram slots and I have changed my thermal paste of processor and put in its socket , I use only new ram 4 gb Kingston in slots 2 ,after that day I use my 2 gb ram in slot 1 ddr3 pc didn't boot up black screen coming I used this ram in slot 2 but ram is OK it's mean ram is good what can I do help me should I reset the bios or mu processor socket or any other things depnds on it ram slots look right