Memory slot problem

REZWANI

Honorable
Nov 1, 2013
10
0
10,510
Hi
My motherboard has 2 memory slot's and neither of them works I'm sure my memory is fine I put it in either one and none of them works I get 3 long Beep's and the display don't show anything
I cleaned the memory slot I thought maybe there's dust in it but nothing happened

PLEASE HELP