Since upgrading to Yosemite 10.10.3 my iMac will not connect to my home BT wifi

As the title suggests, since I upgraded my machine to Yosemite 10.10.3 I cannot get it to connect to my home BT wifi. It automatically connects my to a BT wifi hotspot (and says Wifi connects in Network) but when I manually select my home hub it says no IP address and cannot connect. I have re started, deleted the plist files and turned off bluetooth but nothing is working. Please help as I need Internet access! I can connect to home wifi without any problems on my iPhone/iPad. Thanks in advance.