More DIsplay Problems on HPx2301 Monitor when connected to my MacBook Pro - OSX Snow Leopard

1) HP x2301 monitor
2) OSX 10.6.8 AND OSX 10,7
3) On-Screen Message "Monitor Going to Sleep"
I previously reported that the problems with my new monitor had been fixed with a change in DVI cable.
Unfortunately the fix lasted for one day.  I powered off both the monitor and macbook, came back the next day and the monitor no longer detects the power book.  Same is the case with an iMac and an old mac-mini.  My external older Viewsonic (connected also via the same DVI cable) has no problems. 
When the monitor is connected to the macbook, the macbook detects it and acts like it has dual screens - the System Preferences>Display app shows both monitors (and allows me to change resolution of the HP.  Dispite this, the Monitor cannot detect a signal from the Mac.
Looks like a defective Monitor - will be contacting HP in the morning.
Also of note is that the included Documentation describes 6 control buttons on the base of the unit, including an Auto Adjust button for the user to " Press to activate the auto adjustment feature to optimize the screen image."  Unfortunately, there are only 5 control buttons - there is no Auto Adjust button.
The documentation makes no mention of OSX, although it appears that drivers for the monitor have been included in the OSX distributions.

I'm back up - now using HP to mirror laptop screen.  Got replacement DVI cable from HP, plugged it in an Monitor is working (again).  So I have 3 seemingly identical cables - 2 supplied by HP, and one an older one I used with a Viewsonic DVI monitor.  
1) The cable that shipped  with the Monitor never worked,
2) The older cable worked for one day with the HP,  then stopped working on the HP monitor, but worked with the older VIewsonic monitor,
3) The replacement cable from HP that is working currently.  
I believe they are all DVI-i - pins appear to be identical on all three.
So I don't think its a settings or cable type issue.  I suspect that the HP may have some circuitry that makes it very persnickity when it comes to signal detection - so perhaps there's some small variation is signal quality btween cables - not sure how to check that though.
We shall see if the cable 3 works for extended period.

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