I bought my 13" MBA knowing it had no HDMI port but could buy adapters and whatnot on ebay. I got myself a long HDMI cable and tested it with my PS3 - it works fine. I also bought this so it would work with my thunderbolt port: http://www.ebay.co.uk/itm/300731714379?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 Anyway I hook it all up to my TV and it doesn't work. When I switch to the correct HDMI channel on my TV it makes my MBA screen turn off for about 1/2 a second, so the connection is there.... but then nothing else happens? Anyone know what's wrong and what I should do?