Dual monitors not working

[hove131]

I had dual monitors working on SL with straight HDMI out of the card to HDMI into my flat screen. I have one DVI out of the back of the card to the monitor and then I plugged in my HDMI cord into the back of the card to my flat screen TV and nothing. Is Lion the problem? Will it work if I use the other DVI to HDMI instead? Just looking for the problem here to tackle.

 

[lflaco2000]

Reading other posts (resolving other problem) I found that PCIRootUID=1 could cause the dual screen problem (HDMI prim and DVI sec)
Try booting with PCIRootUID=0, if that works, make it permanent.

 

[hove131]

How do you make booting up with PCIRootUID=0 permanent? I thought these bot flags had to be manually entered at boot every time.

 

[lflaco2000]

In /extra folder check for a file ending with boot.plist, edit it and the enter:

<key>PCIRootUID</key>
<string>0</string>

 

[hove131]

In /extra folder check for a file ending with boot.plist, edit it and the enter:

<key>PCIRootUID</key>
<string>0</string>

Thanks I will try it out. Eric