windows 7 - Task Manager & Resource Monitor Does Not See Added RAM

I added a stick of RAM in my Sony Vaio laptop which runs on 32-bit Windows 7 Home Premium, the laptop had 3GB of ram, now it has 4GB (I swapped a stick of 1GB ram to a stick of 2GB).

After that, both the Task Manager and Resource Monitor does not see the 4GB, they both say "Total 2911MB", but the Resource Monitor shows 4096MB Installed RAM. I went in msinfo32 & saw it lists: "Installed Physical RAM 4GB", "Total Physical RAM 2.84GB"

I checked in BIOS, it says: "System Memory 4096MB". I went in msconfig.exe and cleared the "Maxmium memory" box. It does not change a thing.

Does anyone know why? And how to make all 4GB RAM available?

EDIT: I performed Memory Diagnostic Test by using Windows built-in tool, it returned with no errors found.

I also found under System it shows: "Installed physical RAM: 4GB (2.84GB usable)

I attached screenshots of msinfo32, Task Manager, Resource Monitor as below:

ALSO: The picture of the greyed out BIOS options:

Answer

Its "Hardware Reserved", This usually happens when your motherboard either claims it or if Windows denies it.

It might be one of the following

• The stick is not compatible with your Motherboard


• The RAM stick is bad.


• If you have 32bit (You do), you get about
  3.5GB from 4GB.


• It can be that you have two different brands of RAM, They might have the same MHz but they also have to have the same Memory Timings.

Sometimes running System Assessment in control panel will get windows to accept it. (Windows 7)

Edit: My bad, Around 2.9 GB is normal for 32bit 4GB systems, It Varies a good bit system to system. I expected maybe 3.5 would be available. Some Configurations use more, some less.