No it will reset your BIOS.. you will just have to reset the time on it. Sometimes there can be error's in there and things can go wrong so somtimes you have to reset it. I wouldnt give you any advice that would ruin anything. Everything will be ok.
Edit: Did they send you new IDE cables with the motherboard? Since you said your friend's hard drive didnt work either, Maybe could be the IDE cable?




























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