Verizon MIFI4510, password is no working

Hi everyone,

I just got a Verizon MIFI4510L from work, it has a sticker on the back of it which had the wifi password, I wrote that down and used it to connect through my mackbook and it worked fine. All of this happened yesterday. Today I powered te Verizon MIFI4510L on, and it won't connect?? so I go and try to enter the password that was working fine yesterday in, and it wouldn't accpept it ??

Any ideas?