Samsung monitor blacks out

I've been using a Samsung monitor with my 2008 MacBook Pro, running Lion for a couple of years now - it's been rock-solid stable. I use the Samsung as main monitor with laptop as secondary.
Past couple of days, the Samsung has been blacking out - seemingly NOT triggered by anything. If I unplug the cable at MacBook end and replug immediately, everything is fine. I have tried restarting, PRAM reset, Permission repair, etc. Things are hot here in New England at the moment, but stats on heat and fan speed look fine on iStat Pro (the immediate deplug/replug suggests its not a heat thing anyway).
Thanks for any and all thoughts,
Vince
Here's the Console Log from the time when it last happened:
7/6/13 8:23:24.436 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.436 PM Activity Monitor: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
7/6/13 8:23:24.436 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.436 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.436 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.436 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.437 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.437 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.437 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.438 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.438 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.438 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.438 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.439 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.439 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.439 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.439 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.440 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.440 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.440 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.440 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.441 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.441 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.441 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.441 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.441 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.441 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.442 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.442 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.442 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.442 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.442 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.479 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.480 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.480 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.480 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.480 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.480 PM Activity Monitor: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.480 PM Activity Monitor: _NXGetScreenRect: error getting display bounds (1001)
7/6/13 8:23:24.711 PM loginwindow: kCGErrorIllegalArgument: CGSGetDisplayBounds: Invalid display 0x0b4156b1
7/6/13 8:23:24.711 PM loginwindow: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
7/6/13 8:23:24.712 PM loginwindow: _NXGetScreenRect: error getting display bounds (1001)

Did some further troubleshooting today, and wanted to share for anyone looking for solutions.
Tried both DVI and DVI-RGB connections (different cables) on the Syncmaster monitor and symptoms were the same.
Tried DVI-RGB into my Epson EX5200 projector - NO SYMPTOMS.
Did some further digging, and there are reports of the Samsung Syncmaster 2333SW doing this with PlayStation, Television, etc. No resolution other than monitor hardware malfunction
Bottom line - this is not an OS X, MacBook Pro issue.
Vince

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