If you reseated the CPU and tried different RAM already it could be you have a defective motherboard. I read some other threads where that was the case.
Hit ctrl-shift-esc to quick open tasks/performance. Are apps using a total of 8 gb? What are you running?
What other hardware do you have installed in your system?
Can you take a screenshot of the Memory tab of Resource Manager?
It looks like the BIOS is reserving the memory for something. Reserving memory is pretty normal, but 8 GB isn't. Have you tried resetting your bios to default settings.
If a big chunk of ram isn't available this is usually because your system is using at as video memory, typically in the absence of a full GPU card. If you don't do a ton of gaming or video editing you can probably go into the BIOS and reduce your video memory to 1-2GB, or if you have a separate GPU then set it to as low as possible.
Where would that be in bios? I've got an asus but unsure currently what specs
Mine is under the advanced tab and video memory. Of course my computer is 10 years old though so it has an actual BIOS, newer computers have a similar UEFI menu.
I had this issue once on a PC a few years ago. I ended up having to slightly over volt the RAM in the bios. After doing that I no longer had any issues. By slightly I mean I upped it by the smallest increment once or twice.
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