New ram won’t load pass windows screen NV79

Oct 16, 2018
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I have a gateway NV79 that I installed 2 4 gb sticks of memory in as a upgrade.it was not enough ram for what I am using the laptop for so I purchased pny 8 gb sticks of memory.now that I installed the memory ram in my laptop it will not boot pass the windows screen.what will solve the issue.