External monitor on standby not recognised properly

I've MacBook Pro 15'' (late 2011) and I've attached an external monitor Samsung SyncMaster 2494HM using Mini DisplayPort to HDMI Adapter cable.
After starting up my mac and the external monitor is on standby (not switched off), both screens go blank (meaning no Dock and no top menu bar can be seen nor activated). You can only see their respective background colors (in my case the grey color on the external monitor and and blue screen on the Laptop) and nothing else. There is no other possibilty to switch off the mac while pressing long enough on the laptop's power botton.
After restarting the mac and the external monitor is switched off, the laptop screen is fully accessible (meaning the Dock and the top menu bar are there and functional). When turning on the external monitor, then all the mac recognises both screens and you can operate normally on both screens.
Before updating to Mountain Lion I had no problem with the external monitor being on standby.
Anyone having similar experinces?

I have a similar situation and I found out that I am using two external dispalys, one through the thunderbolt and the other through display link diamond external usb display. When I upgraded to Mountain Lion, it suggested that the driver is incompatible and I downloaded a new driver from Display Link website and that started correpting everthing on my mac book pro (early 2011).
The Finder window does not start and started crashing with a log. Same thing with system preferences and a lot other apps such as iPhoto. I did a clean install and put the driver back on and again it started doing that. I did a clean install again and this time trying it since yesterday and it works alright with out the Display Link driver.
I still had an issue with my the remaining Samsung SyncMaster B2430 display going on and off every few seconds. I could not find any solutions for this so far.
I believe, I did a mistake by taking up on Mountain Lion without waiting for it have it's issues resolved.

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my external hard drive is not recognised on my mac book pro

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Why do I download BUGGY BETA OS? When will I learn ? DON't DO IT!
(sorry for shouting...)
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http://support.apple.com/kb/HT1573
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External monitor on standby not recognised properly

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