8GB of RAM Installed, only 4GB detected/used by BIOS/Windows 7 (with P67A-GD55)

Let me start off by saying that I'm not very good with computers. At all. I know a little bit about them, but I am by no means an expert. That said, I have 8GB of RAM installed on my motherboard, spread out across 4 sticks. However, upon looking at my BIOS and my Windows Resource Monitor, it declares that I only have 4GB of RAM installed and usable. This is what I know so far:
- This issue has been prevalent as long as I've had my computer, and by extension my motherboard and my RAM sticks, so this issue isn't recent.
- I do have a 64bit version of Windows 7. I've checked and double-checked, and I'm 99.5% positive that it is.
- Speccy, a 3rd party program designed for checking system specs, declares that I do, in fact, have 8GB installed.
- I don't think that the RAM is bad because the BIOS still does pick up on different statistics of the RAM that are in the slots; it just fails to register the actual fact that they're there.
System Specs:
OS: Windows 7 64bit SP1
CPU: Intel Core i5 2500K @ 3.30GHz
RAM: Patriot PSD32G133K 4x2GB DDR3 @ 498MHz
Motherboard: MSI P67A-GD55 P67 LGA 1155
HDD: 977GB SAMSUNG SAMSUNG HD103SJ ATA Device (SATA)
Optical Drive: LG DVDRAM GH24NS50 ATA Device
GPU: AMD Radeon HD 6870 1GB VRAM
PSU: Cooler Master 750 Watt
BIOS Version: E7681IMS V1.5
Now this is where it gets interesting: My motherboard has 4 DIMM slots for the RAM, and the motherboard (I assume by default) works in dual-channel mode. This means that DIMM 1 and 3 work together and so do DIMM 2 and 4, which most of you probably understand. However, filling up all 4 slots only gives me half the RAM. So I remove the RAM from slots 2 and 4, and it results in all 4GB of RAM being detected. Then, I add in each other RAM stick one at a time, and it fails to register both. So I remove the RAM from slots 1 and 3, and keep the RAM from slots 2 and 4, and it ends up in all 4GB being registered.
I feel like the answer should be directly in front of me, but from endless Google searches and posts on other forums, I have ended up at a dead end. I'm completely clueless, so I could really use some help.
Any and all help would be appreciated.
Also, if this is the wrong forum for this, feel free to move it wherever.

Quote from: Jack on 28-August-11, 01:11:56
What is your current UEFI/BIOS Version?
The usual cause of such problems is (apart from bad memory slots or a defect of the processor's memory controller) a contact problem between the boards CPU Socket contact pins and the CPU's contact pads. Broke or bent pins are one explanation, in other instances a heatsink that is fastened to tight can also cause such issues.
I'll have the BIOS version up in a moment, but I'll see about diagnosing if one of those problems might just be what is my problem. Any tips on doing that?
Also, BIOS version is up in the OP now.

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Dear Customer
- There are several additional situations that could cause the usable RAM to be less than expected. These issues and possible solutions are listed here:
Check the system configuration settings
This problem may occur because the Maximum memory option is selected incorrectly. To fix this, follow these steps:
Click Start
Collapse this imageExpand this image
, type msconfig in the Search programs and files box, and then click msconfig in the Programs list.
In the System Configuration window, click Advanced options on the Boot tab.
Click to clear the Maximum memory check box, and then click OK.
Restart the computer.
Full Ram will be working properly
Please let me know
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Quote from: Jack on 28-August-11, 01:11:56
What is your current UEFI/BIOS Version?
The usual cause of such problems is (apart from bad memory slots or a defect of the processor's memory controller) a contact problem between the boards CPU Socket contact pins and the CPU's contact pads. Broke or bent pins are one explanation, in other instances a heatsink that is fastened to tight can also cause such issues.
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function(){return A.apply(null,[this].concat($A(arguments)))}
Mistle22 wrote:
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8GB of RAM Installed, only 4GB detected/used by BIOS/Windows 7 (with P67A-GD55)

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