I've found some HP models can be very picky with RAM and even CPUs (had a Pro 3300 which claimed a CPU which was on the supported CPU list, er, wasn't supported, and it refused to boot).
From some Googling, it seems several others have reported issues with upgrading the RAM on this model, from
this thread Crucial recommended a specific part number, saying the 3130 needs low density memory (part number CT51264BA160B which is a 4GB module). It does sound like you have a compatibility issue with the RAM you've bought, in any case it's not working for you so I would look to return that.
Hope this helps.