Annoying display switch - How to disable monitor/display detection in Win7?

I upgraded to a new projector from an older Sony with DVI to a Sony VPL-HW30AES. I am still using the dual link DVI cable that is behind walls. However, I am using a DVI to HDMI converter to connect the projector.

My setup consist of a Win7 MediaCenter PC with an AMD card. The primary display goes to a VGA screen that I use as the control screen. The projector is setup as the secondary display. I am using the extend function. I keep MediaCenter full screen on the projector screen.

The issue:
When I power on my system the PC is switching MediaCenter to my control (VGA) display. After a projector power off MediaCneter is not switched.


With the old projector the MediaCenter remained on the projector screen even when the projector was switched off. At least it didn't jump to the VGA screen.

So, the issue is that wehn powering on the projector the full screen MediaCenter app is switched from the projector screen space to the VGA space.

I checked all the stings and couldn't find anything "do not detect display". Catalyst is set to detect displays manually. Also, on the projector side I tried to disable any HDMI power smarts.

Any help is appreciated!

It don't seem to "loose" the display when powering off the projector. Something seems to happen when powering it on. I wonder if disabling some W7 discovery service would help.

So, this is as simple if I power on the projector the display switches. When I power on I hear the typical Windows sound for recognizing a device. The same as plugging in a USB stick. Is there any way to get this fixed? Would it help if I switched off "auto discovery" of devices? Can that even be done on Win7?

After some more research I came across one potential solution. Disconnect the "hot plug" pin. Pin for reference: http://www.hdmi.org/installers/insidehdmicable.aspx

I have not tied it yet. I am still hoping for Win7 based solution.

Anybody came across a solution for this?