Hi, Simple problem that I'm not able to resolve. I run ML and I just bought an external display (Dell U2312). Since I don't feel like buying a new trackpad and a wireless keyboard, I would like to keep using my MBP keyboard and trackpad. But I also want to shut off my internal screen so I can save some energy and avoid heat problems. How can I do this ? I tried all I could with the preferences options (mirror, not mirror) and I tired with the CTRL+ALT+Eject command : failed. Anybody could give me a hand on this ? That would be appreciated. Thanks.