an am radio?

Probably not bios, but the monitor.Try turning the radio in different directions if possible. Note that the worst interference is when computer is booting before logon screen appears.If am radio is really important to you in general there are am radio antennas commercially.I have one called SELECT-A-TENNA.http://www.selectatenna.com/If you are short on money you can build your own"http://www.google.com/search?hl=en&q=build+am+antenna&spell=1Above google search yield inexpensive ways to build am antennas and general ways to improve am reception.Good Luck.http://www.selectatenna.com/