Can't get clamshell mode to work with my moniter

I can't get my Air to work in clamshell with my HP moniter

My dell 2408 arrived today and I'm having exactly the same problem.I cant get it to go into clamshell mode. I lie, I got it to go into clamshell mode once. I don't know what I did. But it certainly isn't willing to go into clamshell mode again any time soon.

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Can't get 'clamshell' mode to work with Dell 2408

I have been trying to get my Dell 2408 working in clamshell mode without any success. I have a USB keyboard, USB mouse, power adapter and monitor via DVI plugged in. I switch the display type to mirror, close the lid, wait for it to sleep, then wake it again by pressing a key on the keyboard.
The computer wakes, the external monitor flashes but at the incorrect resolution (1200 X 800 instead of 1920 X 1200) then goes back to sleep. This will repeat over and over again until I open the lid of the macbook. I can occasionally get the macbook to wake and display on the eternal monitor but this is very rare, and when it does I get some wired artifacts.
What's really puzzling is that the monitor works flawlessly in extended desktop mode, and works perfectly with other non mac computers. I took the macbook to the Genius Bar, hooked it up to the apple cinema displays and i didn't get the same problem! Grrr....
So I just don't get it, both the computer and display seemingly work fine independently from one another, work fine in extended mode, yet in clamshell mode have some fairly major issues.
Anyone have any ideas?

My dell 2408 arrived today and I'm having exactly the same problem.I cant get it to go into clamshell mode. I lie, I got it to go into clamshell mode once. I don't know what I did. But it certainly isn't willing to go into clamshell mode again any time soon.

Can't get clamshell mode to work

I would like to use an A1081 HD cinema display with my macbook pro and I have connected it to the HDMI port. I have attached an external keyboard and a mouse in one of the USB slots on the keyboard. I set it to mirror display, but evey time I close the lid it goes to sleep and I can't wake it up with keyboard or mouse.
Have I forgotten anything?

Thanks for the info, but could you tell me why you think it will work and is it the only USB peripheral device that can be used for this?

Clamshell Mode Not Working With Acer V223W

I recently got an Acer V223W 22" monitor to use at the office with my MBP. Using the DVI port, it works well, but I cannot get clamshell mode to work. I close the lid, and when I awaken the computer with a mouse click, I know it wakes up because I can hear the audio, but the Acer display does not light up.
Any suggestions as to how to fix this are welcome!

This may be relevant: 2011 MacBook Pro Repair Extension Program for Video Issues.

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I have an Retina display MacBook Pro with HMDI out port. I also have an HDMI to Component cable with Audio Plugs. How can I get HDMI out to work with this cable when plugged into the Component and Audio ports on my TV?

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<Link Edited By Host>

Can't get out.print to work with XML jsp tags

<jsp:scriptlet>
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Please review the "stickied" threads near the top of this board, about syncing with Windows 7 and Vista. It's all there.
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How can I get photoshop CS2 to work with Windows 8.1?

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Have a look at
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Can't get clamshell mode to work with my moniter

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