problem with my PC RAM

No, ATI RADEON HD 6850 is the graphics engine chip. Need to know the video card manufacturer and model number.

The RAM must be compatible with the motherboard, and it must be installed in the correct slots. The RAM may have been compatible with the MSI board, but not the Asus.

If you can tell us the brand and model number of the 2 sticks of 2GB RAM we can check to see if it meets the specs.
If you can tell us what slots the RAM is installed in we can see if it is correct also. The slots are usually marked A1, B1, A2, B2.

Do you have your motherboard manual?

There may be a setting in your BIOS to enable/disable system RAM to be dedicated to graphics. It may be buried in a sub-menu under something like Hardware, Onboard Devices, or Advanced.

As TVeblen said if we have the model numbers of the board and GPU we may be able to fins an online manual.

Also see if you can disable the board's boot logo so the POST (Power on Self test), it will, rather quickly, show installed RAM.

Well, the RAM should be compatible. For best performance Asus recommends installing 2 stick of RAM in slots A2 and B2 (the blue slots). Have you tried that?

So you are back to trying to discover why the system is reserving 2GB of RAM for hardware.

The first thing I would do is reset the UEFI defaults. Make note of your current settings (so you can set them back later if you need to) and the go to the Exit Tab and select "Load Optimized Defaults". See if that changes anything.

Other than a mouse and keyboard what do you have attached to this computer?

Here's a look at what I have for Hardware reserved with 2 printers, a UPS, 2 SSDs, DVD/R, and wireless adapter.

Could you check again. I know you have done it once.
Please post a picture of this. Hopefully I'm not getting in the way.