Connect 4 cat5e lines to 1 ethernet in wall

Hello,
i ran a cat5e cable to each wall.They are home runs. With the plan to make all the connection at one junction box this would make them connected in parrallel.Hooking up just 1 works find,but trying to connected any more i loose the single.infact just connecting about 4' of cat5e cable will also drop out that single. What do i need to make them all work at the same time so i can plug my laytop into any port and work from that particualar station?