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Jun 8, 2015 12:27 PM in response to marc208by MichelPM,No.
Your year and model iMac doesn't meet the minimum hardware requirements for either Yosemite or Mountain Lion.
The highest OS X your iMac can be upgraded to is OS X 10.7 Lion.
However since your year and model iMac can only address 3 GBs of RAM, max. OS X 10.7 Lion may not run very well on that Mac.
My advice is that you keep your iMac running OS X 10.6.8 Snow Leopard.
It is the best OS X version for that Mac.