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RAM slots are not recognize - Dell Dimension C521 PC Desktop

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Rub the RAM with Eraser in the golden part and then try......

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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PC won;t boot after memory upgrade


your comp can only handle so much ram,you also need to use the same ram,check how much ram it recognizes with only two,then 3,then 4,64 bit comps only recognize 4 gb,32 bit recognizes any gb ram.

May 22, 2015 | Computers & Internet

1 Answer

Dell dimension 4700- added 2gb module in memory slot one, color coded white, and added 2gb module slot 3, also color coded white. only 2 gb recognized by computer, the second module is not recognized. ...


This motherboard uses inter-leaved RAM and RAM needs to be installed in pairs.
Check the BIOS RAM settings.
Try and use the same make of RAM.
One of the RAM modules may be faulty.
Try inserting the RAM module that was in slot 3 to slot 1

Feb 19, 2011 | Dell Dimension™ B110 PC Desktop

1 Answer

Running a 1 gig stick and a 512mb stick, system only shows 896mb, apparently not recognizing all of the ram installed?


I assume that you've booted the computer with _ONLY_ the 512MB stick installed, and that the computer recognized it (reporting either 512MB or 384MB), i.e., the 512MB RAM is not "defective".

Hmm. 1024 minus 896 is 128.
So, the "integrated-into-the-motherboard" video-card is "stealing" 128MB of your RAM, to be used strictly for "video" purposes, leaving 896MB for Windows to use.

Now, about the "missing" 512MB of RAM.

1. If you have four slots for RAM, and they are physically arranged into two pairs of two slots, rather than four equally-spaced slots, your motherboard is capable of "dual-channel" mode. But, since your two sticks of RAM are not "matched" (size, speed), you _MUST_ insert both sticks into _ADJACENT_ slots (not slots 1/3, nor slots 2/4), in order to run your RAM in "single-channel" mode.

2. If you have two slots for RAM, interchange the two sticks, to see if that makes a difference.

Aug 19, 2010 | eMachines W3507 PC Desktop

1 Answer

I replaced a 250 RAM slot with a 1GB RAM slot. There is no difference in speed. Ran a Norton system check and it is still recognizing the 250 mb RAM instead of the 1GB RAM.


try resetting the computer, if that doesn't work it could be that your computer only recognizes 250mb or your BIOS needs to be configured.

Aug 10, 2010 | Electronics - Others

1 Answer

Dell latitude wont read 256 megs of ram only 128


The c600 can handle up to 512MB of RAM, so it's likely one of your RAM sticks is bad or not seated correctly. Are you using two 128MB sticks? Remove the stick from the second slot and turn on the computer with only one stick installed, and see if the RAM is recognized. Then take that RAM out and try the computer with only the other RAM stick -- if either is not recognized, that stick is bad.

If both are recognized, try reinstalling both RAM sticks and see if the computer will recognize them. If not, make sure they are both seated properly. You may have a problem with the second RAM slot if it is still not recognized. If you have access to other RAM, try that too and see if it is recognized.

Jul 27, 2010 | Dell Latitude C600 Notebook

2 Answers

I have intel 845 glly desktop board with 256 mb SDR. When I added 128 mb SDR in the second slot it is not recognising it. How to add 128 mb SDR with 256 mb SDR. When I fix 128 mb ram in first slot and...


1st try to exchange the cards in the slot.
2nd try another card
3rd ur RAM slot may not be ok
4th ur RAMs may not be compatible
5th ur new RAM card may not be ok
use same type of RAMs, and same size...
if u have 256, add 256
if u ahve 128 add 128
if u have SDR then dont add DDR
getting compatibility is little difficult...
some times no combinations can work...
note...technology keeps changing...so a old RAM card that was bought years ago may not be compatible with a new RAM card....
even i got all my old RAM cards(256+128) removed and got 2 - 512mb of the same type fixed...even i had issues with my RAMs for 6 months...

Dec 27, 2009 | Intel D845GLLY Motherboard

1 Answer

Dell M60 only recognizes 1GB of ram; used to see 2GB.


Is the memory the same size ?and belive it or not some machines don't reconize ram even thought it is installed ,if it is running good and your os reads the ram 
don't worry about it if not let me know 

Dec 24, 2009 | Dell Precision M60 Notebook

1 Answer

T5082 RAM upgrade


you should always use the same size ram chips, never mix sizes, this can and will cause failures

Jun 11, 2009 | E-Machines T5082 PC Desktop

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