Hi there, I installed OSX Yosemite yesterday on my MacBook White Late 2009 Model. It's working great except from the wifi. It's connected but I don't have internet. If I turn the wifi off and on again I do have internet for 10-15 seconds and then nothing again. I tried static IP, dns, dhcp etc. nothing fixed the problem. I change the encryption of the wifi, I changed the channel, I changed the password. Any suggestions?