External Monitor on Macbook Pro freezes after deleting old profiles

Environment:
15 inch MacBook Pro, Mid 2010, 2.4 GHz, 8GB, NVIDIA GeForce graphics
Yosemite 10.10.1
External Monitor: Samsung SyncMaster 245T running in Extended Mode with the laptop
I have been using the above setup for several years with no issues. Yesterday I did a calibration of the external SyncMaster monitor with Datacolor Spyder3 as I have done many times in the past. The calibration was saved, but an error message flashed by before the file was saved. Checking with the ColorSync utility, the new saved colorspace appeared somewhat smaller than the last one.
I noticed that I had too many old profiles from previous calibrations still there, so I tried cleaning the directory up. I opened System Pref/Display/Color, clicked on an unwanted profile and delete the profile, and reset it to the profile that I wanted. Repeated this a few times and the SyncMaster appeared to be good.
Now I tried the same with the Macbook. Fine, deleted a few profiles but something now messed up the SyncMaster. It colors, including the dock, contorted to an ugly mess. Cursor changed to a spinning wheel, and I could not click or select anything either on the SyncMaster or the Mac. Rebooted, pulling the Syncmaster adapter out of the mac. Everything good, until I plug the Syncmaster back in, and I am back to the spinning wheel.
There must be some way to uninstall, re-install the Syncmaster?
How can I resolve this?
Any help would be much appreciated. Thank you.

Aha, all is good.
I went to Library/ColorSync/Profiles/Displays
and to home/Library/ColorSync/Profiles/Displays
and deleted all SyncMaster.icc files. I did leave behind one SyncMaster file in the home/../Displays which had an old date and I new was ok.
Rebooted, plugged in SyncMaster, and a new icc file was automatically created in the /Library/../Displays folder.
My display works normally, now.

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Aha, all is good.
I went to Library/ColorSync/Profiles/Displays
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My display works normally, now.

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