Windows 10: Only 4GB RAM usable out of 16? -- using Windows 10 64 bit

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  1.    07 Nov 2017 #11

    1) remove the battery for cmos reset and try it.
    2) cpu bent pin or cpu cooler is very tight.
      My ComputerSystem Spec

  2.    07 Nov 2017 #12

    I can think of different scenarios to how this may have happened :

    1 - The earlier owner tackled PAE off , so now you are actually running on 32 bit ram handling model which has a cap of a little bellow 4 gbs of ram .
    2 - The system can actually be 32 bit with moded system panel to reflect it being 64 bit just in text .
    3 - The previous owner ran some sort of RAM Disk that resides or run silently .
    4 - The Bios require a reset .
    5 - The GPU card has a default or moded driver that toggles Shared Memory and was manipulated to direct as much of reserved memory to card .

    I suggest :
    1 - Try running : BCDEdit /set PAE ForceEnable in an elevated command prompt (Or google PAE and 32 bit systems) .
    2 - Try booting with winpese-x64 boot disk found here in forum to see if it can allocate the lost ram .
    3 - Try RamDisk see if it can access higher rams .
    4 - Just skip the jumpers and software resets , just remove bios batteries for a couple of minutes before placing them back .
    5 - If winpese-x64 can access the whole ram then as a suggestion do a clean re-install of windows not a reset , it is not a good strategy to mend a manipulated Windows , there might be more back fire waiting to happen .
      My ComputerSystem Spec

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