i have an abit kt7 that did that. i hadn't used the mobo for a while because i blew out the power supply. i just recently got a new power supply for it. i installed it and when i switched on the power it wouldn't post, i had to switch on the power then press reset every time i turned it on. but after a week, the problem went away so maybe if you just ignore it and the computer elves will go away.