Okay I've searched a few threads. But I'm not seeing hardly anything that relates to my issue for the clamshell mode. My problem is that I'm in my 17 inch macbook pro, and I can find my external monitor, sometimes. But mostly I cannot close the lid when it does find the external monitor. I have a 27 inch vizio, and I've hooked up through thunderbolt and hdmi. I've ordered a thunderbolt dvi, in case that is an issue. However, I understand that clicking the external bluetooth keyboard, I've done this. I've wiggled the wires etc. I'm running 10.8.3, and the upgrade to 10.8.4 was miserable, with the wireless runaround. So I see the flicker issue that i experience is in the 15's in thread. My macbook pro 17 has the same flicker issue, the screen pauses out, and comes back sometimes and then doesn't come back at all. I've relieved myself in power saver settings of the sleep feature, though I have to manually sleep if I leave my monitor. I really don't want to have to keep the screen open. I'm space desperate, and I really function better as a person, and have a more productive existence when the clamshell is in operation and I have things the way that I want them. But is this want just a dream, or can it be fixed ? I thought going to i7 would solve all my problems and enable me as a functional adult.