I have got a real puzzler for you.
I have a Sony PCV-RX790G desktop machine. This machine has been working fine for about two years. Recently, there have been some strange noises coming from the inside of the machine. Not from the PC speaker but from inside the box. The noises are very quick and do not sound like they are coming from any speaker (not even pizeo) but I can't narrow it down. They just happen to fast. The noises are basically two different sounds. Not tones but rather sounds. They go "high--lowlow--high" in a rythm like bump--bumpbump--bump. I have looked at Sony Bios beeps and there is nothing specific. The closest thing I found was an overheat code on the CPU but its running at 104F. This doesn't happen all the time but it's really annoying.
Thanks if you can help,