IMac display problems with gray to white gradients

My early 2006 iMac 20 has problems displaying gradients going from pure white to light gray. The web colors are #000000 to #EEEEEE (RGB 238 238 238 and 255 255 255)
My cheaper Acer and Fijutsu Siemens displays can handle this very well, but my iMac cuts the gradient prematurely and makes the gray darker. It looks as if the gradient on my iMac is a dark gray bar and a white bar, instead of a smooth gradient compared on the two other monitors.
I know the iMac doesn't have the best display for a designers need, but it can't be that 'cheap' or can it? I have tried to calibrate the display with both manual expert mode and using ColorSpyder. The latter gave me a blue/magenta colormode with beige gamma each time, so I gave that up.
The frustration is that I have use my iMac as secondary display and one of the other primary. It is not the optimal arrangement for an office environment.
Does anyone have the same problem or do they have any good advice for me as of what to do?

Thanks for all the speedy replies.
Barbara:
This was reassuring news, I have been using Spyder2express with both the bundled calibration software and another professional (and high revered) software, which name is completely lost to me right now.
In both cases, with blinds shut, lights turned off and no other interference, I got a beige/dark result from both. With a bit of flicking with the settings, I managed to produce only a sick magenta result.
Your post reassures me that it can be done, so I am going to borrow the Spyder2 again and try all over, even read myself to death on the instructions once more.

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