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I'm going a bit nutso today. Yesterday afternoon, my 2-yr. old HP desktop started this loud buzzing noise (not a humming sound). It sounds like an old alarm clock. My wife could hear it in her TV room, and my office door is a long way from there. Yet it's running just fine otherwise. So I tried to find the cause. First, I shut down the computer; the buzz continued. Next, I pulled the power cord; the buzz continued. Then I pulled off the side cover and using a pencil eraser, stopped each of the fans while the machine was running; the buzz continued. Now it was time to isolate some of the hardware by disconnecting wires. I started by turning off the desktop and unplugging the main power supply to the mother board; the buzz continued. I followed by disconnecting the HD, CD drive and card reader; the buzz continued. After a few hours of messing with it, I turned it off late yesterday afternoon and unplugged everything connected to the case; the buzz continued. When I came out to my office this morning, I could hear the buzz was still going as soon as I hit the kitchen for my coffee. And my hearing is so bad that I have two hearing aids, which I didn't even have on. This morning I decided to try a couple other things. Since the buzz continues even when there's no AC power, I thought the battery might be providing the power to keep it buzzing. I pulled the battery; the buzz continued. Then I removed the four screws holding the power supply in place and pulled it out far enough to figure out it wasn't doing the buzzing. Now I'm completely stumped, especially about how it goes on without any AC or DC power. The only thing I can't check easily is the CPU and the rest of the other motherboard parts. Any computer experts have a suggestion other than take it to a computer tech?