Can't use external display w/o magsafe connected while lid is closed

I've got the latest 15" MBP with Retina Display. At work I connect it to a 23" Cinema Display and at home I us a 20" Cinema Display in my studio.
The desk I'm using isn't big enough to host my MBP with the lid up with my 20" display side-by-side , so I have to keep my MBP folded all the time. When it is folded I have noticed that I need the MagSafe adapter connected all the time, or else it will not let me use my 20" display or the USB ports. This means that I can't use my Apogee Duet via USB either, if I don't connect the MagSafe adapter.
Now you might think "well, you're at your desk, just connect the adapter and be happy". I would love to, but the thing is that I record lots of guitars in my home studio and when my computer is powered by the magsafe and I've got a guitar amp running I get lots of humming noises in the signal. I've tried different power outlets and stuff, and I can't do anything but unplug the magsafe to get rid of the problem.
Is there any one else out there with this problem, that you can't use an external display (or your USB ports) with the lid closed without Magsafe adapter?

Well the official document, posted by CT, on clamshell mode doesn't support your theory that it worked with your older/pervious macbook pro and it certainly doesn't work like that with your newer mac.
So you are either mistaken or your older/pervious mac was broken in some way to allow it to work without a AC adapter connected.
henkeblomqvist wrote:
No it hasn't. My previous MacBook Pro handled that just fine.
And I do have trackpad and keyboard connected, both via bluetooth.

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HI Ezfilez,
I understand you are having an issue with the external display on your Windows 7 computer.
Sometimes it is in the BIOS. If you follow the link and update it should help resolve your issue.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=bph07110
Please let me know if you require further assistance.
Thanks
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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Can't use external display w/o magsafe connected while lid is closed

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