Satellite C55-A-19N: 4GB RAM installed but only 2,39 is usable

Hello,
I have Toshiba satellite C55-A-19N with Windows 7 32-bit. It has 4 GB of installed memory, but only 2,39 is usable.
Bios is the last.
I can not find anywhere in the system the ability to change it.
My desktop with core i5-2500K can see 3.29Gb from 4Gb RAM, why toshiba cant see it?

The shared part depends on the RAM amount which is installed.
The notebook description and the NVIDIA GeForce 710M details says this:
Video card: up next to 3787 MB with 4 GB system memory installed
and up to 4,095 MB with 6 GB of system memory (64-bit Windows operating system only).
So the shared part seems to be bigger than 300MB.
By the way:
open msconfig using search
in msconfig click on boot
next inside boot click on advanced options
In boot advanced options click on maximum memory and increase the value
then click OK. Next click apply in msconfig and then restart your pc

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OS: Windows 7 Home Premium 64-Bit
CPU: Intel i5 750 @ 2.67Ghz
Motherboard: MSI P55 GD65
Ram: G.Skill 4x 2gb 240-Pin DDR3 1333 (PC3 10666) dual channel memory (8gb total)
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Quote from: RemusM on 17-March-14, 15:34:37
OK.
Perform the following tests with 2 memory modules (4GB RAM):
1)
1.a) use the slots 1 & 2 (those close to the CPU).
Check out the usable system memory
1.b) use the slots 1 & 3
Check out the usable system memory
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3) use the same 2 memory modules (4GB), access the BIOS and make them run at 1066MHz (7-7-7-20 at 1.50...1.55V)
If all the above don't fix the issue, post a screenshot of the memory mapping (System Information / Hardware Resources / Memory)
Good luck.
Alright, RemusM...got some new developments here. Thanks for sticking with me....
1)
1.a) Slots 1 & 2 (single channel mode): 4gb installed, 4 gb read and usable by OS
1.b) Slots 1 & 3 (dual channel mode): 4 gb installed, 4gb read but only 1.99 usable by OS
I stopped there and did some more slot tests...and I stand corrected from my earlier comments (I had written down that each stick worked in each slot, individually, but these notes are from 5 years ago...so...however):
With only 1 stick installed (2gb), starting closest to CPU:
- Slot 2 (blue plastic slot): PC will not start, motherboard beeps 3 long beeps (ram error, from what I Googled)
- Slot 1 (black plastic slot): PC starts, 2gb read and usable by BIOS and OS
- Slot 4 (blue plastic slot): PC will not start, motherboard beeps 3 long beeps (ram error, from what I Googled)
- Slot 3 (black plastic slot): PC attempts to start (3 times, fans and lights start and then stop) and then it hangs (with fans and lights on but does not start)
Would I be right to assume my Slot 3 has been the problem all along? Or is the motherboard supposed to only start with 1 stick of ram in slot #1?
Also of note: since I first built this computer it has always took 3 attempted starts (fans and lights go and stop) to finally fire up (I know, I should have realized this red flag sooner and probably mentioned it).
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