Aporte original por: MrJimPhelps ,
Are you sure you purchased the correct memory for your laptop? If so, maybe the memory you bought is defective. I bought some memory once from Ebay. It appeared to be the correct memory; but the computer wouldn’t boot all the way after I installed it. Turns out the memory was for an AMD machine, and my machine was Intel. After the seller told me that, I looked back at the product description, and sure enough, it said that it was for AMD machines!