Guest
[Entry]
"Hi,
How much RAM do you have installed?
According to the specifications for a Q504UA it is 12 GB DDR4 2133MHz SDRAM, up to 16 GB SDRAM.
This link from Crucial memory seems to indicate that 2GB, 4GB, 8GB and 16GB SODIMM modules are compatible with your laptop and that there are two (2) slots. Although you cannot exceed 16GB maximum.
http://www.crucial.com/usa/en/compatible....
You said that you had the laptop open. Did you check the motherboard under the keyboard to see if the RAM slots are there?
Update (12/11/2016)
Hi,
The following is all speculation on my part.
Looking at your picture, the only thing I think that I can see which may be RAM are the 4 ICs in a vertical row between the CPU and the fan.
If you Google the number that is printed on the IC it may be that they are a 'memory 'type IC (Nand flash perhaps since they all look the same). Hopefully if they are, then the number may also indicate the capacity. I cannot enlarge it enough to read what is written on them
Since there are 4 it could be that they are 4GB each and perhaps one of them is not being accessed by the BIOS if you have only 12GB working
I have searched online for pictures of identical replacement motherboards and they all show the same as yours. What you see as the green pcb is the entire motherboard so there is nothing extra under the 'black' which I think is the battery. There is also nothing under the HDD as there is no suitable external connection for RAM on the motherboard.
If the IC numbers indicate that they are not a 'memory' type of IC then there is the possibility that there are RAM slots on the underside of the motherboard. I could not find any reverse (underside) pictures of the motherboard to see what is there, so you would have to totally disconnect the motherboard and remove it to see what is underneath."
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