I bought a new MBP a few weeks ago. I upgraded to Lion last week. I bought a Samsung LE40D580 HDTV last week. I bought a Mini Displayport to HDMI adapter off ebay, and an HDMI cable from Amazon. I've tried connecting my MBP to the TV, and it doesn't seem to recognise it. If I connect it to the TV whilst the TV is off (in standby mode), then the MBP screen flashes blue for a second and it will recognise the TV (there is a Samsung window in System Preferences > Displays). However, when I turn the TV on, the screen on the MBP flashes blue for a second again, and the Samsung window disappears from Display preferences and the TV is not recognised on the MBP anymore. In addition, the MBP is not recognised as being connected by the TV, and the screen just says no device connected (I've made sure I've selected the correct source input channel on the TV - HDMI 1/2/3/4 etc). I have never tried this whilst SL was installed on my MBP so I can't say whether it's a problem with Lion. I have no idea what to do and I bought this TV predominantly so that I could connect my MBP to it. It's really frustrating and I was wondering if any of you guys had any ideas/suggestions?