[The_Dunadan]

i've never heard of beeping because of overheating but it does make sense. think about it, it didn't do it during the colder months but when summer comes it starts getting hotter and overheating (beeping). just because your fan is working doesn't mean its not overheating. i think it probably has to do with that. if not, do like pika said and check your bios manual, though i never heard of just one random, long continuous beep before.