Half of ram seen by PC ??

RichardvMeelis · Dec 13, 2013

I know that there have been more posts about this problem, but nothing seems to work for me:
I'm using 4x samsung 1rx8 pc2 6400u 666 12 zz 1gb memory units, but only slot 1 and 3 are recognised by my pc:

Slot 1: http://gyazo.com/4275606a2d03bd94e3480e39011e30aa
Slot 2: http://gyazo.com/45de098d6372d31cb9ff5f8a7e0da9d1

I'm running a 32bit version of windows and I know I need the 64bit version, but at first it showed 4gb. After a while, my computer wouldn't start up (only the fans and lights were on), so people suggested to switch the memory places. This fixed the start-up problem but now I got this new problem..

Richard

COLGeek · Dec 13, 2013

Are all 4 memory modules the same, identical model?

BTW, with 4GB of memory, a 32-bit OS is fine. To use more than 4GB, you need a 64-bit OS.

What make/model is the motherboard?

RichardvMeelis · Dec 13, 2013

COLGeek :

Yes, exactly the same modules
and my motherboard is a Dell 0PP150
(pc name is Dell XPS 630i)

Btw, when I switch 2 ram modules, the ones in slot 1 and 3 still work and the others don't

Richard

COLGeek · Dec 13, 2013

When you access the BIOS, does the memory in slots 2 and 4 show anything?

RichardvMeelis · Dec 13, 2013

COLGeek :

Well, I couldn't find that info in my BIOS, I don't know if I need a other version or something..?

RichardvMeelis · Dec 13, 2013

COLGeek :

I did find that it says 2gb ram, but it doesn't show the seperate slots..

COLGeek · Dec 13, 2013

You may actually have a defective motherboard with slots 2 and 4. That would be my guess at this point.

RichardvMeelis · Dec 13, 2013

COLGeek :

Cant be, if I only put a module in slot 2, it works

COLGeek · Dec 13, 2013

Ah, that is odd. Sounds more like a power issue now in that the motherboard is having trouble powering all 4 slots.

Also, what CPU is installed in your rig?

RichardvMeelis · Dec 13, 2013

COLGeek :

Might be power issue yes, do you know how I could check/fix that?
And here are the cpu specs:
http://gyazo.com/9467e0f449ab6dcb80623aefeee71c92

And I noticed that at the memory section it says: Channel #: Single
http://gyazo.com/588afb290e70923e8ebb3ccfc5db5e09

COLGeek · Dec 13, 2013

I am starting to suspect a memory controller issue. You could try resetting the BIOS to its default state (you might want to check Dell's website to see if you have the most recent version installed. If not, install it).

I would further suggest (with all 4 modules installed) running Dell's Diagnostics (see link below) to see if it identifies anything.

http://www.dell.com/support/my-support/us/en/22/product-support/product/xps-630/diagnose

RichardvMeelis · Dec 13, 2013

COLGeek :

I resetted my bios and still nothing, but I will try it again. I do have the newest version (2009).
I will also run the test

psaus · Dec 13, 2013

If these modules are new(newish), I'd blame the modules before the motherboard or CPU. Memory is more likely to go bad, than the others. And knowing you have an OEM system, it should be spec'd properly to support this configuration (e.g., not a power issue).

The laborious test is to take one of the modules you know works, and place in each of the slots one by one. If the system works each time, then you know it's not the mobo or CPU.
If you then take one of the questionable modules and use it alone, you should find that one module is bad (rarely would one have a pair of bad modules.)

Once you find the culprit module(s), RMA the pair and you'll be back in business

RichardvMeelis · Dec 13, 2013

psaus :

If these modules are new(newish), I'd blame the modules before the motherboard or CPU. Memory is more likely to go bad, than the others. And knowing you have an OEM system, it should be spec'd properly to support this configuration (e.g., not a power issue).

The laborious test is to take one of the modules you know works, and place in each of the slots one by one. If the system works each time, then you know it's not the mobo or CPU.
If you then take one of the questionable modules and use it alone, you should find that one module is bad (rarely would one have a pair of bad modules.)

Once you find the culprit module(s), RMA the pair and you'll be back in business

I can't believe it... 2 of my modules are broken..

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Half of ram seen by PC ??

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