1 ram slot working

Oct 11, 2018
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Hi guys,
Appreciate if any one can help me on this.i recently built a gaming computer but unfortunately my 1 ram slot not working, with 1 4 gb ram its working fine but when i insert the other 4 gb, my computer dont give display and pc gets restarted after 30 seconds.... i have cleaned rams slots and lossen the motherboard also but still the same.

My both rams are fine i checked.

Please help
 
What motherboard do you have?

Have you tried both RAM sticks in the slot you know that works to make sure its not the RAM that's faulty?

Did you buy the RAM in a dual channel kit or separately?

If it is indeed the motherboard contact the manufacturers and request a replacement, if its the RAM do the same or if you can return them to the retailer.