T420 won't boot with 2x4GB RAM (two identical RAM)

Hi all,
I am experiencing a weird issue that I'm hoping you'll be able to help me with.
My T420 came with 1x4GB of ram (underneath the keyboard) and I wanted to upgrade to 2x4GB RAM so I bought exactly the same RAM again.
Both RAMs work fine by themselves, in the bay under the keyboard as well as in the bay underneath the laptop. Both RAM were tested individually in both RAM slots. The laptop works just fine with either of the RAM individually in either of the RAM slots.
BUT if I put them both in at the same time, the T420 won't boot. It switches on (screen stays black) and instantly switches back off. Without pushing any button, the T420 will then switch itself on again about 3-5 seconds later. This process is repeated indefinitely. I don't even get to see the ThinkPad security screen where you can access BIOS. I switched the RAM around in the slots but this didn't resolve the issue either.
I have never had anything like that before. Does anyone have an idea on how to solve this problem?
Thank you very much in advance.
Regards
Lippasti

Has seriously no one ever had this issue? There must be a solution to this since I can rule out that either one of the RAM or the RAM slots is damages since each RAM works fine in each slot separately. I'm only experiencing this issue if I put them in simultaniously.
Is there possibly any BIOS settings which I need to adjust prior to installing the second RAM?
Not that I think it matters since I can't even boot it to the Windows screen but here are some specs. I am using a Kingston 512GB SSD and the other specs are:
Here's the RAM I am using.

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<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText"><b>haroldkarl wrote on Sun, 22 January 2006 12:03</b></td></tr><tr><td class="quote">
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