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I have the same mobo, running a 2.8 overclocked to 3.17 using the stock HSF, and my idle temp is about 40c and it goes up to about 58c under heavy load. The LGA775's run hot but yours is very hot.
Saying that some HSF's aren't properly attached on some Asus boards doesn't really make sense since Asus doesn't put the CPU/HSF in the mobo - whoever assembles the machine does that. It could be that whoever assembled your machine didn't properly seat the HSF or properly apply thermal paste to it.
Your CPU isn't likely to be damaged because they throttle themselves if they get too hot (they slow themselves down to reduce heat).
You should have a case fan on the bottom front of the case blowing in and one at the top rear blowing out - what's your case fan arrangement? Do you have your cables bundled so they aren't obstructing the airflow?
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