Has anybody had problems upgrading MBP 13inch (2010) to 8Gb RAM?

Hi Folks,
I'm new to the Apple Support Communities.  I've searched the discussions on this issue but couldn't find something exactly the same. I installed two 4Gb, PC3-8500 DDR3-1066MHz memory sticks in my MacBook Pro 13 inch (2010 model), but it wouldn't boot up.  I then re-installed one of my old stock 2Gb sticks and the MacBook Pro booted and showed 6Gb memory under System Profiler.  The memory runs fine and I've checked the RAM using Rember and it passes all the tests.  I've had no freezes or other weird behaviour on the MBP with the 6Gb configuration but I just can't get it to boot with both 4Gb sticks installed.  Does anybody know what's going on here?
Thanks!

I have exactly the same problem like you, just got my new 8gb (4gbx2) DDR3-1067Mhz, PC3-8500 from Vgen and I can't use both ram in my mid 2010 mackbook pro. I've checked the requirements before buying the ram with apple support and bought the ram as suggested by apple support regarding ram upgrading (I also read some posts saying that some people who upgrade the ram with 4GBx2 PC3-10600 instead of PC3-8500 had problem to boot but it boots fine if they combine 1 PC3-8500 + 1 PC3-10600). funny and wierd thing is both new ram are working fine because I tried to combine each new ram + 1 stock ram and they were installed fine, clockspeed is correct which is PC3-8500..I contacted apple store and they ask me to do the reset parameter ( Hold 'Option' + Command + P + R then boot, keep holding until you heard 'dong' sound twice and then release) but still not working either.
Then I also try to install only 1 single ram, both old stock ram were booting but both new ram won't boot...the only working method is to install 1 stock ram + 1 new ram (total only 6 GB of Ram)...this is really frustrating and it's ******* me off because I have followed instruction and bought the exact ram as required and suggested by apple and it's not working....**** it....how can thing like this happen..geez...Please somebody from apple explain this and give us solution...
Note : since bought items are not refundable so I try to call the store where I bought the new ram and had them agree to replace 1 pcs 4GB PC3-8500 ram with PC3-10600 ram and will see if it works with 2 different clockspeed Ram installed in my MBP Mid 2010 and will post the result again later after.
I'm using MBP 13" With Lion OSX 10.7.1 and 6 GB RAM (Apple, I want my other 2 GB Ram back)

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