How to get computer to read 4 DIMM slots instead of 2

December 21, 2017 at 10:11:45
Specs: Windows 8
I decided to upgrade my Alien R4 desktop from 32 gig Ram to 64 gig, I couldn't get it to respond with my computer, so I put my old ram back in slots, I have 4 8 gig sticks, I went to boot computer now it only reads 16 gigs of Ram, 2 DIMM slots, any suggestions....

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#1
December 21, 2017 at 13:16:16
It would help to post a complete model number. I'm guessing you have a system from the Alienware Aurora R4 series in which case the max amount of RAM it can accept is 32GB (4x8GB).

https://www.dell.com/support/articl...
http://www.crucial.com/usa/en/compa...

If the full 32GB (4x8GB) is no longer being detected, it's probably because the sticks weren't properly reinstalled in the slots. Shutdown the system & unplug the power, remove the side cover, lay the tower on its side, then remove the RAM sticks. When you go to reinsert them, snap them in & out of the DIMM slots a couple of times to ensure they're making good contact.


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#2
December 21, 2017 at 20:55:46
As above, you can also clean the contacts on the memory stocks with a soft clean pencil eraser, remove all dust and then pop them in and out of the sockets 4 or 5 times to burnish the sockets also.

You have to be a little bit crazy to keep you from going insane.


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#3
December 24, 2017 at 08:02:42
I tried cleaning my Ram sticks also I have took them out and put them back in several times, I do know they are in correctly, also I switched all the sticks back and forth in each of the DIMM slots, so I know the Ram is good, Just I cannot get it to read all 4, I even cleaned the DIMM slots out, still no luck. Any suggestions would be appreciated.

message edited by Cindypribula


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#4
December 24, 2017 at 12:48:58
Sounds suspiciously like incompatible DIMMs, which is odd if these are the old ones. Try booting off of only one DIMM at a time, in the first slot, and replace the DIMM with the next one if you successfully boot.

If that works, try booting off of only one DIMM, and moving it across the slots to make sure each slot is working.

If that works, check for and apply any BIOS updates.

If there's no updates, make sure all of the DIMMs are installed, boot up, open PowerShell, and run the following. It will take an inventory of the DIMMs, as Windows sees it, and saves it to the clipboard. You can then paste the results here:

gwmi Win32_PhysicalMemory | ft -a Capacity, PartNumber, DeviceLocator, Tag, BankLabel | clip

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#5
December 24, 2017 at 20:48:12
You will need to access the BIOS set up and reset it to defaults, then manually check all major settings to make sure that they are set optimally. When you put in the unsupported RAM the BIOS detected them and does not appear to be correctly detecting the original RAM sticks. Resetting the BIOS should fix that.
As an alternative, you can enter BIOS and manually set the RAM settings as per the specs on the labels on the RAM sticks, Save and Exit and you should be all set.

You have to be a little bit crazy to keep you from going insane.


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#6
December 27, 2017 at 04:51:03
I have tried to reset Bios, haven't had much luck on this, I did take Ram out checked them all in good slot they are fine, but when I put good Ram in the slots that do not seem to work, I do not get an error code, They run ok but my monitor does not come up...Very confused...

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#7
December 27, 2017 at 11:19:09
Well, without the exact model number of the MB, I can't look up its manual to see if it's picky about placement for its DIMMs, but if the BIOS has the same timing and voltage settings for each slot, I'd suspect the two non-working slots were damaged in some fashion.

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#8
December 27, 2017 at 20:47:18
Damage can be caused by a static electric discharge like what happens when you shuffle across the carpet and touch someone - Zap - if you did not take a second to discharge yourself before touching anything internal to the computer.
.... just a thought.

You have to be a little bit crazy to keep you from going insane.


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