After upgrading to ML, now a RAM Failure

I have a 2009 MacBook Pro. I use it for my business in a retail store.  I upgraded it 2 months ago from 4gb to 8gb RAM.  I even made sure the RAM was compatible.  It is not made by Apple (RAM).  Today I upgraded to Mountain Lion, and the computer won't turn on.  When I try, it makes 3 loud beeps continuously.  I tried to re-seat the RAM, with no luck.  If i put the old 4gb (2  2GB sticks) RAM in, the computer boots fine and Mountain Lion runs.  If I try to return to the upgraded RAM, it will not boot but give me a RAM failure audible beep.  The 4GB is TOO SLOW!  I'd rather have 8GB of RAM running on Lion then 4GB running on Mountain Lion.  Has anyone had this issue or have any suggestions?  I NEED this computer for my business and its SUPER important.  I actually use it as my register.  PLEASE!!

TravisCarterNY wrote:
I can't tell if its Value RAM or just regular.  It doesnt say Value on it.  As for an update, I have reset the PRAM and SMC with no luck.  The only thing that does work, is leaving (1) of the old 2 GB sticks in with (1) of the new 4GB sticks.  This for some reason works and the machine is testing OK with 6 GB of RAM.  However, once I try to place the other new 4 GB stick in for the complete 8GB upgrade, I get the 3 Beep RAM failure on startup.  Anyone have any ideas ?
Yes, return the Kingston Ram and order from www.crucial.com or www.macsales.com, reports of problems with Kingston Ram are commonplace.

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