I have a Abit KT7A running a Duron 700MHz. Everything seems to work fine, but every so often (may be 2 or 3 times an evening) the little speaker built into the computer makes a strange sound. It is like a whistle that starts high and then falls in frequency, all in the space of less than a second. The sort of sound some little bird would make! It doesn't appear to be associated with any particular program (I don't do games), or key stroke. Moreover, it doesn't seem to cause any problems. I'm just curious.😕