Toshiba L100 equim memory update

Question

i have got a crappy 256 memory and have purchashed 2gb (2x1g memory) and have attempted to install however when i have snapped the new memory the laptop will not recognise the install. i had an initial problem where the pc would not even start up. i have therefore re-entered the 256 memory and have managed to get on line. Is there anything i need to do to get the pc to regonise the new memory. Also, will this spec PC accept an upgrade from 256 to 2g ?