Anyone have this problem before or knows what is causing this ? Occasionally I get a high pitch bleeb that last for about 5 or 6 seconds. But just one bleeb. No error message, no interference with what I was doing, etc. Everything working properly. Just the ONE bleeb once in a long while. Occurs sometimes 3 days from the last one. Sometimes, the next day, sometimes more days. But it is there. Never happened before till lately.

Is there a hardware wire connection problem or some software problem ? Anyone know or have experienced this before ?

I am using Windows XP with SP3, Iinternet Explorer 7 and Outlook Express 6. I also have Mpozilla Firefox installed, but seldom use and never have both IE and Firefox running at the same time. This is a late addition some 2 months or so ago. My pc is Sony Vaio Z1VA with new Samsung 160GB HDD, having 2 partitions. All softwares are regularly updated. Have AVG Antivirus, PC Tool Antivirus and Zone Alarm Firewall for ages. Apart from Firefox, there's no new software installed.

Hoping someone can solve this mystery. Thanks