After maxing out RAM, laptop starts fine, but OS won't start

My laptop is a Toshiba Satellite C655D-S5057. I swapped out 2x2GB for 2x4 GB modules. The BIOS posts fine and I can enter setup. However, Windows will not start from the HDD. The laptop freezes on a black screen with a white cursor line in the upper lefthand corner (just prior to what would be the Windows screen). The cursor blink about twice and then freezes. Also, I cannot boot from my DVD-Rom either.
It also freezes when I have just 1 x 4Gb in either slot.
However, if I put 4GB in the bottom slot and a 2GB in the top slot, Windows starts normally.
The BIOS is the latest version ( 1.8). I also disabled legacy USB support with no luck. I dropped HDD to be the second boot device, however, no luck there either.
I am running with 6 GB since that allows it to start, but I'd rather use my pair of fours...

what memory are you using? You should always make sure the mfg (corasair, etc.) certifies that the memory you are planning in using has been tested and compatible with your computer. You need ddr3-1066 but this does not tell you the timings. that is where the mfg's come in. Use the wrong timings and your lucky to get it even to boot. Using mismatched is also not recommended as you will loose the dual channel feature and you might as well just put your 4gb kit back in as it will perform better than a mismatched 6gb kit.
L305-S5955, T9300 Intel Core 2 Duo, 4GB RAM, 60GB SSD, Win 7 Ultimate 64-bit

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