Display problem - Too Contrasty

I am using Mac Mini, connected to a HP widescreen LCD monitor via VGA-VGA cable using the adaptor came with the Mini.
It was all fine before. But now the display gone too contrasty. I have changed the cable and even the monitor itself (as I thought the monitor was faulty and returned for a new one), still the problem exists. I have to plug out the VGA cable connected to the Mini adaptor (sometimes including the adaptor itself) and re-plug it in, and that seems to solve the problem. I have to do that everytime I start up the Mac Mini.
Can anyone please let me know whats wrong and how to solve it?
Thanks.

I will try both again when I get home.
I work on photo editing a lot, so, calibrated the monitor using SpyderExpress. I don't really want to use option 2 you mentioned as that might not give me accurate color. But I will try option 1 you mentioned.

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