I got the butt ugly results.

Here is my tale of woe...
Was trying to calibrate a 24" aluminum iMac last night and had all kinds of problems. Tried it using both Easy and Advanced modes and nothing seemed to help. Even though I would enter in "Native White Point" the color temperature at the end would always be between 7200 and 7700. Also tried setting it for a target of 6500 6000 and it would still come up high until my last attempt.
Problem was that I still could not use that profile because even though I had the gamut set for 2.2 it would give me higher gamuts ranging from 2.4 to 2.7 which made everything look really strange. Sort of a brown tone with a lot of blown highlights on pictures that were normal before.
Was doing this in a totally dark room at night so there was no issue with different color temperature light shining on the screen. I should note that it has been successfully profiled before but it has been several months so was just doing a new one in case of any drift. Anybody have a clue to what is going on?
The only good thing about last night was I finally got the Luminance down to 140 with a freeware program I found on the Apple site called ScreenShade. Before, the screen was so bright the lowest I got was 179.
Andrew, it appears that there may be a sheet of glass in front of the actual LCD screen on mine. Do you think the extra distance could have the light bouncing around more and giving a false measurement?