Calibration: iMac displays grey as white

I bought a hardware calibration tool (Spyder 3 Express) to adjust my Mac's monitor (iMac 27" 2011).
Everything looks fine, but yesterday I saw a photo of me on another monitor and noticed a greyish background. My iMac displays pure white and I didn't see the grey. It looks pretty unprofessional :-(
With Photohop's eyedropper tool I can see it is not white but about 248 250 251
So, how can adjust it? Is the iMac able to display this fine grade of grey? I hope so, the other monitor was a LG for 150$

The slider was on the left.
Here is a screenshot of a photo. The left photo is how it looks on my Mac. The other two are how the photo looks on other monitors.

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IMac displays only black & white

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Actually baltwo, I called Apple early in the morning because I had not gotten any responses from the forum. I did check 1) ColorSync Utility, select Devices->Display, and peruse the display profile settings, and the information was not there but I did not try your 1st suggestion 2) Run through Displays->Color->Calibrate (using the advanced mode). IIRC, that should allow you to determine those items.
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Hello sprdthewrd,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
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User Contributed Tips in Intel-based iMac Your Intel-based iMac Display

*The following User Contributed Tips are located in the Intel-based iMac > Your Intel-based iMac Display forum:*
a brody - Using a second Mac as a display for a first
http://discussions.apple.com/thread.jspa?threadID=1587927
Publish date: July 7, 2008
*The following related tips are located in other areas of Apple Discussions:*
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http://www.derman.com/iMac-Fan-Control
http://www.lobotomo.com/products/FanControl/index.html

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Calibration: iMac displays grey as white

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