ethernet will not connect with yosemite update
27" iMac working fine until May 5 Yosemite update. Now it will not make an ethernet connection. Under network I get, "Cable unplugged." Which of course is not true. Am able to connect via wi-fi only. I reinstalled Yosemite 10.10.3 hoping that it would not have the May 5th update, but it did and no luck. Anyone else? Any solutions? Thanks!
iMac (27-inch Mid 2011), Mac OS X (10.7.2), 16 gigs ram, SSD HD