Well you can't put LGA775 cpu into LGA771 socket, physically impossible.
You can always take the IHS off and check cpus stepping.
If it says:
SLANU = C0, mobo fckd up.
SLBBK = E0, It's time to update bios.
For an example:
http://xs330.xs.to/xs330/08351/dsc_0188771.jpg
Stepping code reads on the middle line :]
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