Macbook Pro doesn't wake with external monitor

I have a mid-2012 MBP that generally runs great.
I recently bought a new external montior (samsung) and am currently running it with a VGA adapter. 
When I put the computer to sleep using the command function, it's fine; however, if I shut the clamshell, the whole system will not turn back on (monitors), although it is clear that the harddrive / fans are all active.  The only way I've found to fix it is to do a hard shut down (holding the power button).  This is obviously not acceptable ...
Anyone have any ideas on how to fix this problem so I can put my computer to sleep normally (closing it) and have it awake when I open the clamshell?

try taking out the vga connector, don't really have a 100% but it might be something to do with your settings.
Joseph

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