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Windows 7: Weird behavior when turning off the lights.

25 Mar 2012   #11

Windows 7 Pro with SP1 32bit


Not to worry. The digging won't me in my premises.

Amarnath Wanchoo

Quote   Quote: Originally Posted by quickdraw2011 View Post
Quote   Quote: Originally Posted by wanchoo View Post
Can't understand what is happening because I don't believe in poltergeists and ghosts. Since when has this strange behaviour started? There has to be a rational explanation if we dig deeper.
Hey, when your digging careful not to fall in it!

My System SpecsSystem Spec
25 Mar 2012   #12

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1

Quote   Quote: Originally Posted by 4hya View Post
attached is a rough draft of the setup
Some questions:
  • What country are you in? Is it 220v or 110v power grid?
  • Is the lamp and the PC plugged into the same wall outlet or outlet strip?
  • Are you using any wireless devices with this PC?
  • What devices do you have externally connected (printers, external drives, etc.)? And where do they get their power from (wall outlet/power strip)?
  • How old is the building you are living in (modern wiring or old wiring)?
My System SpecsSystem Spec
25 Mar 2012   #13

Windows 8.1 Pro RTM x64

Do you have a wireless mouse/keyboard or some other such peripheral connected to your PC? If so, what I think is happening when the light is being switched on is this. With a fluorescent light, when it is switched on, it usually flashes 2 or 3 times until it strikes and lights. Each time it flashes, a pulse of electromagnetic radiation is released, which, if it is not suppressed correctly, can cause interference to radios and other devices that utilise a wireless connection. My guess is that it is probably the starter that needs replacing, as its built-in suppressor might have failed.
My System SpecsSystem Spec

25 Mar 2012   #14

windows 7 x64

Philippines. Our power grid here is 220vAC. Maybe that is tech enough answer to me. The electromagnetic pulse might cause this. I don't have wireless devs connected to the pc. But have 2 printers. 1 usb mouse 1 ps2 mouse. 1 usb gamepad. 1 usb cam. Wireless router is independent. So that is excluded from the equation
My System SpecsSystem Spec
25 Mar 2012   #15

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1

If there is a problem with the wiring inside the light fixture and it is plugged into the same power source as any of the externally connected devices then it could be causing a momentary short circuit or electrical arc that is briefly taking the devices off line. This would be a bigger problem than the PC issue as any electrical arcing inside a fixture is a fire hazard.

You could isolate which device is disconnecting by systematically unplugging them one at a time and testing. If you find just one device that is doing this behavior you can isolate which power source is affected and narrow down the cause.

I don't see how an EM pulse would affect wired devices, unless the cables are unshielded. That is why I am more focused on the electrical power issue.
My System SpecsSystem Spec
25 Mar 2012   #16

windows 7 x64

I'll try all your suggestions.
btw, the electrical wirings are all connected at the same line. E.g. Pc ,monitor, printer , etc. and the light is wired independently. So they are not sucking up energy at the same ac source
My System SpecsSystem Spec

 Weird behavior when turning off the lights.

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