Macbook wont boot after updating ram

Please help,
I have a white macbook mid 2010 model. Today I attempted to upgrade the RAM in my machine but to no avail. The ram I purchased was 4 GB (1 x 4 GB) - DDR3 SDRAM - 1333 MHz DDR3-1333/PC3-10666 - Non-ECC - Unbuffered - 204-pin SoDIMM PNY 4GB DDR3 SDRAM. I already tried to upgrade a few years ago so I had 3gb or RAM in my machine. I wanted to buy a 4gb stick and use it along side the 2gb stick that I have in now. When I put both sticks in my computer just beeps and wont boot. It will however boot, if i put either stick in alongside one of the original sticks that my machine came with, which would either give me 5gb or 3gb. I have seen people with similiar issues and the answers given was bad ram or bad memory slots. If the memory or the slot was bad, it would work at all no matter what combination you used so that really dosen't make any sense to me. If someone could help me, I would appreciate it.

If you bought your RAM at a place that also sells PC RAM you may have gotten mislabelled RAM. PCs can handle different RAM speeds so they’ll often label higher speed RAM as a lower speed rather than make two different speeds of RAM. But Macs are much more picky. They require a RAM stick to be exactly 1066mhz not 1333mhz. The way to tell is to put one of your old RAM sticks in and it will force the new RAM to run at the correct speed. Your MacBook requires 1066mhz RAM not 1333mhz.
These are good online stores for Mac compatible RAM
OWC http://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3_Whi te - They offer Mac tested RAM at very good prices.
Crucial Memory http://www.crucial.com/ - good place to buy RAM from all over the world. They also have an excellent memory selector that allows you to choose memory based on your computer's model
Data Memory Systems http://www.datamemorysystems.com/apple-memory.asp - another good, cheap place to buying RAM if you live in the U.S.

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