EL_GUAPO

Hello I'm new here, I used Jake Lo's Guide to install Yosemite 10.10.0 on an Dell E6420 i72760QM 2.40. Everything is working except for iMessage. I get a "could not login to iMessage, please check your network connection" I've seen searching for a solution but so far I come up empty. Hoping someone in here can assist. Thanks