Laptop not under warranty. I didnot try default settings in bios. I left the bios as is. I had same issue with the original. In the past I upgraded RAM for dell No issue what so ever. Unless something is blocking it, I am at a loss.
Also, the Acer out of warranty support told me they have speciall software and tools to make this work. Any idea what that might be? Finally according to Kingston all the RAM these days are High Density and perhaps that is why it is not working.