C55D-B5310 RAM Upgrade

I did exactly this. I took my laptop apart and there are 2 slots for ram, but if I put another 4GB RAM the laptop turns on for 5 seconds and then turns off. I already tried 3 different brands, Samsung, Kingston, and Crucial. Why is there 2 slots if It won't start when I use them. I really need help. 

Either that ram is not compatible or the board cannot take that much ram. Your support page is here - http://support.toshiba.com/support/modelHome?freeText=1200009173Your spec sheet is here - http://support.toshiba.com/support/staticContentDetail?contentId=4006598&isFromTOCLink=falseYour specs show:• 4GB DDR3L 1600MHz (not user upgradable) • 2 memory slotsNot sure if that means you have to take it apart to reach the memory (not user upgradeable) or if that means the board will not work with more memory. Try a crucial scan to see what it shows for max memory for your laptop.http://www.crucial.com/    use the advisery tool from crucial:http://www.crucial.com/ScanListView?modelTypeDisplay=&msg=compatible-upgrade-for&urlRequestType=Base&catalogId=10151&urlLangId=&manuFacturer=Toshiba&langId=-1&productLine=SatelliteC55D&mdlName=SatelliteC55D-B5310&storeId=10151&modelCatId=485003 See what's installed now.scan your systemToshiba Satellite C55D-B5310 compatible upgradesThese upgrades are guaranteed compatible when you order from Crucial.com   memory solid state drive  Your Toshiba Satellite C55D-B5310 system specs as shippedmemoryMaximum memory: 16384MBSlots:2 (2 banks of 1)*Not to exceed manufacturer supported memory.  what does this mean? Memory or DRAM is the "es;working"es; memory of the computer. It's used to store data for programs (sequences of instructions) on a temporary basis. storageStorage: SATA 3 - 6Gb/s what does this mean

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    Recommend Crucial, Kingston (not their valueram line), or Samsung memory, which has proven reliable in our PB's. Crucial can be found at their website http://www.crucial.com , Kingston at http://www.kingston.com , and Samsung is available from a number of companies, of which OWC at http://www.macsales.com is one source.

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    I don't own a MBP but that sounds bizarre. Did it shut down as soon as she plugged it in?

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