Thunderbolt and Hdmi Dual Screen MACMINI problem

Hi there,
I have two screens, one connected via HDMI, and another via Thunderbolt, which goes into thru UA APOLLO audio interface's 2nd thunderbolt output, when my Mac Mini starts up it is fine, for around 5 minutes, but then the thunderbolt display always goes blank, the machine still recognises its there as I can still drag things out of my HDMI screen to where the Thunderbolt screen should be, I have tried new cables, cleaning sockets with antistatic cleaners, the thunderbolt screen works fine with out the hdmi screen being connected and vice versa, any help would be greatly appreciated.
(I'm running the latest mac mini, with mavericks up to date)
thanks in advance
Jack

Archimaredes wrote:I don't have much experience with this, so forgive me if I'm wrong, but should that not be 1080, instead of 180?
Thank you, but "180" actually means that the upper border of the 2nd display starts 180 pixels below that of the 1st one. The number may be a bit misleading, but it is how my displays are physically set up.
olive wrote:If gdm cannot behave properly, you can simply disable the external monitor in xorg.conf
This is a fabulous idea, I hadn't even thought about this! Launching the xrandr command at the start of the GNOME session is really easy with gnome-session-properties.
I tried disabling the 2nd display, but it just ignores the line and starts with GDM flashing like usual. This is my xorg.conf:
Section "Monitor"
Identifier "DVI-0"
Option "Primary" "true"
Option "Position" "0 0"
Option "PreferredMode" "1920x1080"
EndSection
Section "Monitor"
Identifier "DVI-1"
Option "Position" "1920 180"
Option "PreferredMode" "1360x768"
Option "Disable" "true"
EndSection
If I could get this to work, this would be a wonderful workaround.

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Thank you, but "180" actually means that the upper border of the 2nd display starts 180 pixels below that of the 1st one. The number may be a bit misleading, but it is how my displays are physically set up.
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