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Strange behaviour from computer

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#1 wstone68


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Posted 29 October 2014 - 02:56 PM

I am sorry if I am posting this in the wrong location but I'm not really sure where to post this problem. I can handle virus, spyware and things like that but I'm not sure this is any of those.


I have an Acer Aspire M3970

16 gb

64 bit operating system

3.0 ghz processor

windows 7 service pack 1


It's a work computer for a 911 center. I have ESRI Mapping on it with a USB Key

I have a wireless Keyboard 2.4 ghz usb

Wired Mouse

Attached is a HP OfficeJet Pro 8600

2 ViewSonic Monitors

Speakers and network is wired though there is a wireless adapter I'm too far from the router for that to work reliably


I have a ghost in the computer. It started about a year ago every time I would get up I would here the Da-Ding sound of a USB being unplugged once I got about 5 - 6 feet away. I have checked everything and even had other people watch me to make sure I was not loosing my mind or hearing things. I have taken the following steps to try and isolate the sound.


1. disabled the wirless

2. taken out the usb 2.4

3. turned wireless off on printer

4. checked to make sure there is no bluetooth on any device in the office

5. turned off all wirless on phones or ipads and left them laying on table

6. I have checked Windows logs to see if anything is happening at the exat moment but can't find anything definative to link to the exact time. Various things within a minute or two but totally random it appears

7. I have updated malware bytes and avast anti virus


I have no cameras on the computer at all


I can be sitting in my chair not touch the computer get up and walk 5 feet and it makes the sound. I have thought maybe I'm moving something but I'm in a room with a concrete floor that I don't really think I'm moving that much. I have had other people sit in the chair and do the same thing and the process repeats for them as well.


The only other thing I can possibly thing of is Static? Could Static do this? Or if anyone has any other ideas on how to figure this out please let me know. It's not affecting the computer as far as I know but it does tend to make one paranoid :)


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#2 Didier Stevens

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Posted 29 October 2014 - 06:15 PM

What you don't mention is if a USB device is actually removed when this happens?

Didier Stevens

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#3 kaylagarcia


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Posted 30 October 2014 - 01:47 AM

Quite simple just give complete scan of your computer with malwarebytes antivirus in safe mode.

#4 wstone68

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Posted 30 October 2014 - 08:33 AM

Think I may have found it..


nothing was being disconnected. I could just sit in front of the computer not touch anything get up and walk away and as soon as I had gotten a couple of feet it would make the disconnect sound. I did not have to touch anything. The floor is concrete and is stable so I can not imagine anything being moved because I could sit a good foot away from the computer and not touch it or the desk or anything and it would happen.


What I have done that has corrected the problem:


I have a kensington trac ball mouse. I unplugged it and replugged it. This so far has stopped the sound.


I saw where a lot of other people were having the same problem and took someones suggestion and watched the device manager while it did it and the entire device list disappeared and reappeared but I could not tell which item was changing if any. So I unplugged all USB devices one at a time and replugged them and sure enough with the mouse done it stopped.


This is a USB Mouse. I was not touching it when the sound would occur, I was not moving the wire, the computer was not moving and it's not wireless. Does anyone have any idea if static could have been doing this?


Thanks for all the replies.

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