Trying to upgrade from 8GB to 16GB - won't boot at 16GB

Here are all 4 SPD slots (these screenshots are all with the original RAM):

When I purchased the computer originally, the model in the shop had 4GB RAM with two empty slots and I had the shop add 4 more GB before I took it home. So when I say "original RAM" I mean what I've been running with ever since I bought the computer some years ago. The computer boots just fine with those 4 2GB sticks.

I now want to upgrade to 16 GB from the original 8 GB (4 x 2GB), and I purchased 4 x 4GB sticks. I bought Patriot RAM 1600 first and couldn't get that to work. I was able to return those for a refund.

I then bought 4 x 4GB Kingston RAM, described above. Those, like the Patriot RAM, will not allow me to boot at all, in any combination of old 2GB sticks and new 4GB sticks, or all 4GB sticks. I can boot with just two of the old RAM or with all 4 of the old RAM but not with the new RAM at all.

Unfortunately, I cannot return those for a refund due to the second store's return policy. I can however exchange them for something else in the store.

So my issue is I'm trying either to find a way to get the new Kingston RAM to work, or to find out why not so I can go back to the store that sold them and tell them what I need that will work.

essenbe said:

try taking all the ram out and install 1 stick of the new ram in the slot closest to the CPU and try to boot up. Make sure it is installed and seated properly. you will be running 1 stick of ram only.

Thank you. I will do that as soon as I get a chance and report back with the result.

essenbe said:

did you update the Chipset Drivers?

No just the BIOS. How do I update the Chipset drivers?

essenbe said:

Find your model number on Gateway's web site and see if there is a newer version of your chipset driver. Was your computer brand new when you bought it?

Yes it was new.