Memory Upgrade Issues

I have a Compaq CQ56 & it has Windows 64 bit on it. It originally had 2GB of memory. I bought two 2GB sticks of memory, the exact same kind that was in it, & it is only saying it has 2GB still in it.....any suggestions as to why it is not recognizing the full 4GB that is in it? PLEASE HELP!!!
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JohnBusiness Consultant (Owner)Commented:
If you are sure the operating system is 64-bit, then the 2Gb limit is most likely the design limitation of the computer. Compaq has not been around for a while, so hardware limitation is the very most likely cause.
wantabe2Author Commented:
nope, it originally had two 1GB sticks. I put one of the 2GB sticks with one of the 1GB sticks & now it does recognize 3GB but that's what it has in it now. I can take the 1GB out & put the 2GB back in & it should show 4GB, but it only shows 2GB.....
JohnBusiness Consultant (Owner)Commented:
The inability of handling 2 2Gb modules may be a BIOS / Hardware limitation. The limit could be the 32-bit limit (which is 3Gb).  Did you try the other 2Gb module?  That is switch and try each 2Gb with the 1Gb.  That will tell you if one module is defective.

But I still think you have a machine limitation that will not work with 4Gb.

Windows 7 will work OK (fair) with 3Gb.

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☠ MASQ ☠Commented:
Or you may have one of the older Intel Chipsets (such as the 945GM and 945PM models)  that can't address more than 3GB of RAM even with a 64bit OS.

Does the BIOS see all 4GB?

Which of the CQ56's is this?  The rest of the model number will give the detail needed to know if you've hit a hardware limit.

There are some CQ56's that are able to support up to 8GB
The chipsets usually limit the amount of memory you can install, but I don't know of any that has a 3GB Limit.

If you can verify that both modules work by following thinkpad's advice above and trying one at a time, I suggest you check whether you can upgrade your BIOS. That can sometimes fix problems with RAM.
Alan HendersonRetired marine engineerCommented:
Have you double checked that it's definitely 64-bit? As inferred above, your result is what would be expected if it's 32-bit.
Natty GregIn Theory (IT)Commented:
this model supports 8 gigs max, so my conclusion is that the memory is faulty

P.S this model only supports DDR3
this model supports 2 GB max :
this means that using more ram - may - work, but is not warranted by Compacq
i would start with Masq : does the bios see  the 4 GB - if not, forget it...
JohnBusiness Consultant (Owner)Commented:
@wantabe2 :

1. Have you interchanged the 2Gb modules with the 1Gb modules to verify the memory?
2. Is the OS really 64-bit (check the system properties)?
a 32 bit system should not have problems with 4 GB (it may show some 3 Gb usable - but in fact it uses all - but not for OS)
JohnBusiness Consultant (Owner)Commented:
@wantabe2  - Thank you and I was happy to help.
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