12-28-2009, 07:00 AM
What you have seen described is how you would use the MB with a 2nd display with the lid closed (in clamshell mode). To suggest this as a resolution to your problem, I believe, is 'grasping at straws' at this point.
Your MB should be capable of running the 2nd display simultaneous with it's own monitor. If it's not, then there is something wrong with the MB. The above could be a work around for a video card on it's way out and no longer capable of supporting dual displays.
Personally, I'll stand by what I have suggested above, that it is either the adapter/cable or the monitor. Regardless, all three (inc'g the MB) need to be ruled out and as of yet, you've ruled nothing out. You have:
a MB that has never been used with a 2nd display.
an adapter and cable that has never yet functioned.
a monitor that has yet to display a picture from anything via it's HDMI ports.
Even if changing the cabling from your MB to VGA enables you to use the monitor, you need to make sure the ports on that monitor work. Since it is brand new, now is the time to make sure and return/exchange it if need be.
Once you have plugged in a DVD player, satellite receiver, etc. and verified the ports work on the monitor to rule it out of the equation, then it's time to take the adapter/cable and MB back to your local Mac shop and tell them either one or the other does not work and let them figure out which. They will have the extra cables lying around to easily check and know for sure.
Ref jukes' suggestion: While you should not require a dual-link cable at a 1920x1080 resolution, I have seen moving to a dual-link cable resolve similar issues on rare occasions. This would again be something to let your local Mac shop check out, as they'll have the cabling there to test it out without you splurging for something you may not require and/or may still not work. And again, I wouldn't even bother with going there until you rule out that monitor.