sorry to answer that late (ok, it's 05:42am ;-)) - i think it's a connection problem - so, yes - open it again and check all the connections, search for broken parts in the area around the "do not remove" sticker
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[http://s1.guide-images.ifixit.net/igi/fMMHDRFSYFBkIgIp.huge|CLICK for a HUGEer version of the picture]
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[http://s2.guide-images.ifixit.net/igi/wVi1mvMfEJF2dDQi.huge|CLICK for a HUGEer version of the picture]
check both sides - the circuits around the golden spring are for the antenna - so if there is a problem - it might lead to those problems. surely - the antenny could also have a problem, but it's not an antenna in the regular way - normally - it fails because of a bad connection