Color calibrating 27 inch iMac display

A few months, ago I purchased a used 2009 27 inch iMac.
After a lengthy move and recnt medical isues, I am back t work doing some design work.
I need to color calibrate my this iMAc 27 inch screen and use Monaco Easy Color with screen colorimeter.
I used this on my old G4 system that used a matte screen instead of a glossy screen like on this iMac.
I need to know what lighting conditions and how to setup my iMac's screen to use/setup to get the colorimeter device and software to accurately color calibrate my iMac's screen.
I am do my design work using Adobe CS3, Painter 11, Blender and to do some technical drawing work using a CAD program for the Mac.
I am, preferably, looking for answers from people experienced with using monitor calibration software and specifically using the Monaco Optix hardware and software to create a profile.
Help is greatly apprecated and any useful links helpful.
Thanks to everyone who responds in advance.

I just bought a 27 inch Imac a few hours ago.
If it were me, for a brand new hours-old machine, I would demand (not ask) for a replacment (not fixed) from wherever you bought it from.  For the prices of these things I wouldn't tolerate that.
In the meantime try smc and pram reset and see what happens.

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