my cpu is making beeping noises

阿邊個邊個

as title.... my computer occasionally makes annoying "beep" sounds... it beeps every minute or every few minutes...
i couldn't find the source of the problem... this is a fairly new computer (bought 2007 sept).

any idea why it is beeping? does it happen to your computer too?

many thanks!

阿邊個邊個

it is making beeping noise every 3 minutes.

i took a look inside, the fan on the mother board and the cooling fan are so dusty.... wonder if this is the source of the problem?

阿邊個邊個

well Phillip, to be more specific, it is a short single beep. the beeping noises are not systematic. It beeps randomly. Sometimes it beeps twice in one minute, sometimes it is fairly quiet for the whole half-hour.

i checked the motherboard, the fan on the motherboard is dusty... is this the source of the problem?