New monitor sleeps and causes computer shutdown

My system was working fine until I purchased and installed a new HP Pavilion 23bw monitor. We've got the monitor set for maximum resolution (1920 x 1080), which should be well within the capability for the dual ATI Radeon HD 5670 graphic cards we have installed.
The monitor has been going to sleep at strange times while the computer is up and running, often in the middle of a browsing session. The monitor loses a signal and cannot find one, cycling through them all and coming up empty even though it was JUST talking to the computer.  I haven't noticed any common thread as to when it loses the connection... it can be anytime while I'm doing anything.
Probably a related issue... I've got an old game called Stalker that I was using to test the monitor, and if I run it long enough (in any resolution), the computer shuts down.  The monitor goes dark and then the computer powers down. Usually on reboot, the monitor initially works but "sleeps" and loses connection before the windows login screen is reached... a second reboot is necessary to bring the system back up properly.
Let me be clear, this is behavior that wasn't happening two days ago with our old monitor... the odds are that something with the monitor is the issue, as that's the only piece of hardware that changed.  To clarify: the computer shuts down while playing a 1st person shooter game, and the monitor "goes to sleep" and loses signal during more normal operations.
I originally attached the monitor using the VGA cable, but I have switched that to the DVI cable and am seeing the same behavior.
I'm running Windows 7 SP1, and the driver information is as follows:  Driver date: 3/20/2013, Version 3.0.0.0 (monitor.sys version 6.1.7600.16385).  
I would appreciate any help, as this is incredbily frustrating.  Thanks in advance...

Hello,
What computer model do you have?
If you use your old monitor now, does this problems go away?
Can you try to make a monitor reset on the menu of the monitor? Its called factory reset.
Have  you installed HP Driver for the monitor and HP My Display that comes on the CD?
If you havent install the driver, try to do it and if you have installed HP My Dispplay, do remove it.
Let me know.
THanks,
I work for HP! Please remember to provide and if this helped click ON

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