Ram Upgrade issues can't boot with 8 gb but can boot with 6gb?

So my macbook pro already has 4 gb of ram, but i always heavily use my electronics, so i wanted to upgrade my ram. I bought the ram, it came in the mail, but when I tried it out, I got stuck on the white boot screen. The circle spinning got stuck.
HOWEVER, when I only used one stick in conjunction with one of the 2 gb sticks, everything works just fine.
Does anyone know whats wrong?
Macbook Pro 13" (mid-2010)
2.4 ghz Core 2 Duo
4 gb ram
250 gb HDD
this is what i purchased:
Click Here

Ah okay, I only bought the mushkin brand because it was little cheaper.
btw I uploaded a video so you can see my problem
http://www.youtube.com/watch?v=HHm3HWMxt60&feature=g-upl&context=G27ac6bfAUAAAAA AAAAA

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Ram Upgrade issues can't boot with 8 gb but can boot with 6gb?

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