Problem with my ram memory

I got 3 gigs of ram and after some of memory burn I'm able to have only 2 gigs of these ram. But today I try to find why. And after a multiples tests I found that on my riser A the slot 2 is lighting on but I try to put my +riser B+ intead of my +riser A+ at the place of my +riser A+ and the same problem arrive. So, after my test I found it's probably my motherboard but I found my +riser B+ works well and I put these configuration and I found my 3 gigs:
*_Riser A_*: nothing
*_Riser B_*:
Slot 1= 1 gigs
slot 2= 1 gigs
Slot 3= 512 mb
Slot 4= 512 mb
So my question is: I know that's not the configuration for the ram memory, it's suppose to be:
*_Riser A_*:
Slot 1= 1 gigs
slot 2= 1 gigs
Slot 3= nothing
Slot 4= nothing
*_Riser B_*:
Slot 1= 512 mb
slot 2= 512 mb
Slot 3= nothing
Slot 4= nothing
but can I have any problem with my new configuration like my ram memory are not working like they should or anything like this?
Thank's!

No, if it is the slot, there is nothing you can do that I know of - I believe the slots are part of the logic board (not sure on a laptop, but they are on an iMac) - to find out, do take it to an Apple store; the Genius Bar advice and diagnosis is free. At least you would know if it is the slot and how much it would cost to repair or replace it. Here is some info that may help:
https://discussions.apple.com/thread/5279862
http://support.apple.com/kb/PH14206

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<GC: -1 62.579563 2 436207616 32 218103808 0 419430400 945040 944592 52428800 109051904 327155712 524288000 877008 877008 1048
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Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1.02-011206-02:17)
Java HotSpot(TM) Server VM (build 1.3.1 1.3.1.02-JPSE_1.3.1.02_20011206 PA2.0, mixed mode)
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Can anyone please suggest what to do proceed troubleshooting or to change some settings? I'm not into this Java really so I really need some help.
Usually the java program handles thousands of smaller files (around 500 KB - 1 MB sized files).
Thanks!

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