First, doing that "bump" thing is not good and not fair to others. Someone will always get around to helping. The original post wasn't even there half a day. Patience.
In regard to the issue, two things. 1. Did you check the manual / specs for your device to make sure it can handle that much RAM? Just because one 'can' add it doesn't mean the device will accept it. and 2. Did you make sure that the RAM you purchased and installed (if the device can actually handle that much) was the exact same type as the original RAM? If it is different in any way, that would make it not work.