Thinkpad W520 Memory Slots

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• Thinkpad T520 Ram Slots
• Lenovo W520 Memory Slots
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I got a W540 machine recently (Win 8.1x64 ). It came prepackaged with 2 4GB Samsung memory chips. M471B5173EB0-YK0.
I used memtest86 to check that they were not faulty.

↳ ThinkPad X200/X201/X220 and X300/X301 Series ↳ ThinkPad W500/W510/W520 and W700/W701 Series ↳ ThinkPad R400/R500 Series ↳ ThinkPad SL and L Series until L420/L520 ↳ ThinkPad T60/T61 Series ↳ ThinkPad T40/T41/T42/T43 Series ↳ ThinkPad T20-T23 & T30 Series. NOT for T25-Retro ↳ Thinkpad X60/X61 Series incl. I still do my main work on my W520, it's got 24GB RAM, my main drive is a 512GB mSATA drive. Mostly using VMs, Chrome, and an IDE. The screen is dim and grainy, it doesn't bother me at all but its a far cry from the X1C which is much brighter and doesn't have a strange grainy look to it. Hello, since you are running a dual core processor and not a quad core, I believe you will be limited to using 2 of the 4 memory slots in the machine. Also, since you are using a 32 bit operating system, you'll be limited to using at most 4gb of RAM. If your Lenovo ThinkPad W520 Series memory upgrade fails at anytime–we will ship a replacement same day. We support your Lenovo ThinkPad W520 Series memory purchase long after the sale. Meet the increasing demands of your applications with more Lenovo ThinkPad W520 Series memory.

Detailed specifications - ThinkPad W520.

I then found and purchased a single 4GB module M471B5173DB0-YK0. I was hoping to have 12GB of RAM to play with.
(The only difference, as you can see, is the 'D' - which refers to the date of manufacture of the module, but all other parameters are the same, of course.)
I used memtest86 to check that module alone to make sure it is not faulty.
I then put in all 3 modules into the slots and couldn't get the machine to go into POST: The Lenovo splash screen didn't come up. The booting process just stopped with a blank screen.
I then used the new module only in one of the top slots to boot the machine - OK.
I used the new module WITH one other old module - so just two modules in the top slots - OK.
I searched online and found various forums where people would complain about a similar issue with W540 memory upgrade - but no apparent solutions.
Can anyone explain this problem to me?
Will this be fixed if I buy yet another 4GB module to max out all 4 slots, or is there something wrong with my motherboard/bios/something else?

Thinkpad W520 Ram Slots

Does anyone know?
What other information would it be useful to provide here?

Thinkpad T520 Ram Slots

Thanks.The Levono Thinkpad W520 Mobile Workstation is the most powerful, robust with 'muscle flexing graphic capabilities' laptop thus far - made its first debut in May 2011. I am so proud to finally own one but it comes with 8 GB of RAM and... I want more!!! So, I purchased an additional 8 GB of RAM from Newegg and attempted to add the new RAM to my machine; it should be a piece of cake right? Yeah, it was simple enough to install the first 4 GB in the 2nd slot (in the bottom) but the hard part came when I had to remove the keyboard to get to the 3rd upper slot. After going through the manual, viewing the videos, and doing everything I supposed to do but nothing worked. The keyboard wasn't flexing - not even one micro of an inch! But thanks to my wonderful husband who offered a solution: loosening up all the screws in the bottom of the laptop and... voila! the keyboard eased out of its housing without any hesitation!!!

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In short, if you need to add more RAM to the Levono Thinkpad w520, here are the things to do:

Thinkpad W520 Memory Upgrade

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1. Read and follow the manual, http://goo.gl/1lUb4, pages 60 - 62.
2. View and follow the video clips instruction: http://goo.gl/DPECL and http://goo.gl/fyjxh.
3. Discharge static electricity by touching a grounded object. Click here for details.
4. Remove all power supplies, e.g., power cord and battery.
5. Loosen up all the screws in the bottom of the laptop including the ones under the battery housing - do not remove the screws!
6. Flip the laptop over and slide the keyboard out as shown in the videos (#2).
7. Install the RAM.