I'm not sure what I'm doing wrong, but I just can't figure out how to keep the computer from going into sleep mode when I have an external monitor connected and the lid on the Macbook is closed. The specs on my Macbook are as follows: Late 2008 13" Aluminum Macbook 2.4 Ghz Intel Core 2 Duo 4 GB RAM NVIDIA GeForce 9400M 256 MB OS X Lion 10.7.3 I am connecting to an older Westinghouse LCD TV with no problems. I am going from the Macbook Mini DisplayPort to the TV with a Monoprice Mini DisplayPort --> DVI adapter. The picture comes across great on the TV but will not stay on once the Macbook is closed. I did some research and found that the external display should automatically stay on with OS X Lion. That's not the case for me. I also read that if a key is pressed on an external keyboard once the lid is closed, this will wake the external monitor. I connected an external keyboard and tried pressing a key, but that also didn't work for me. Lastly, I tried InsomniacX, but it didn't work either. Any ideas on what I could be doing wrong? Thanks.