Blank screen if i remove a RAM bar

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Apr 14, 2011
Ok here is my situation :

I have this setup:
ASUS P7H55-M PRO motherboard
2x Kingston DDR DDR3 4GB 4 G GB Memory Ram PC3-10600 1333 KVR1333D3N9/4G (270856476158)
8GB of Kingston HyperX KHX1600C9D3K2/8GX 8GB 2X4GB DDR3-1600 XMP Dual Channel Memory Kit
total 16GB RAM

This computer always worked fine with this setup, including the four ram bars of two different kingston series

I bought a new computer so i am selling this one to a friend. But i want to keep the two 1600 HyperX ram bars for my new computer. I would like to keep only the 1333 bars

The problem is that as soon as i take out one of the Kingston 1600 HyperX ram, my screen is black when i start my computer. There will be nothing displayed on the screen.

The only way i can see something on the screen is when i have TWO kingston 1600 hyperx connected to the motherboard. It doesn't even works with only ONE of the 1600 ram.

I'm very confused and i don't understand where the problem is coming from. How can i get this computer running with only two Kingston 4GB 1333 ram ?
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