Aopen switch problem

[jackal123]

My aopen 5port switch recently refuses to let me have two devices connected to the internet at the same time. My computer will connect but my ps3 wont, and the only way i can get the other to work is to only plug that "one" in and reset the modem. Anyone know how i can fix this? Im using rogers im not sure if they give you 1 or more ip adresses