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Windows 7: PC reboots if someone walk by

26 Feb 2010   #31
Darryl Licht

Windows 7 Ultimate 64 bit Steve Ballmer Signature Edition

That's a micro speaker for the BIOS.

I thought you said that voltage had to be 2 volts, sry!

My System SpecsSystem Spec
26 Feb 2010   #32

Windows 8.1 Pro RTM x64

My System SpecsSystem Spec
26 Feb 2010   #33
Darryl Licht

Windows 7 Ultimate 64 bit Steve Ballmer Signature Edition

drarf... some cases come with them instead of the 2" paper cone speaker.
My System SpecsSystem Spec

26 Feb 2010   #34

W7 Ult x64 and W8 Pro x64

Quote   Quote: Originally Posted by Dwarf View Post
No, that voltage level is OK. It has to remain at a value that is less than the threshold of 2.0V in order for your PC to operate. To check this, power down your system so that it is on standby and connect a multimeter as described above to the appropriate pins. What voltage reading do you get? Now power up your system. What is the reading now?
I assume this is about the voltage between pin 15 and 16. The voltage changed from 0V to 4.2V when the system was Shut Down or let go to Sleep mode.

This image is taken from one of your images. What is the item that I have ringed? It seems to be obstructing the front panel connectors. Also, route the main power harness away from the board so that it doesn't press down on it.
Attachment 56894
That is a ceramic beeper. The main power harness does not really press down on the mobo. I attached some more pictures below:

Attached Thumbnails
PC reboots if someone walk by-img_4508x.jpg   PC reboots if someone walk by-img_4511x.jpg  
My System SpecsSystem Spec
26 Feb 2010   #35

Windows 8.1 Pro RTM x64

OK, that shows that area more clearly. What I suggest is that you temporarily disconnect all connections except for the power and reset switch. Do you still get the resetting? Now, swap the switches. Any change? If you no longer get the resetting, add one connector at a time and retest. What I am trying to do is to eliminate the possibility of cross-talk between the leads. You could also try using a ferrite core around the offending lead(s) to see if that makes any difference. Ferrite Core 1/4" Cord Noise Suppressor: Electronics
My System SpecsSystem Spec
26 Feb 2010   #36

W7 Ult x64 and W8 Pro x64

I think I already did that as stated in one of my former posts except that about ferrite core. I will go and get it at my local pc shop tomorrow and post back the test result.
My System SpecsSystem Spec
27 Feb 2010   #37

W7 Ult x64 and W8 Pro x64

The ferrite is found not available locally so it will take several days to get it from Amazon.
My System SpecsSystem Spec
27 Feb 2010   #38

Windows 8.1 Pro RTM x64

It's worth a try, but no guarantees. I must admit that I am a little bit stumped by this as it is a most unusual problem.
My System SpecsSystem Spec
27 Feb 2010   #39

Win7 Ultimate x64 on Desktop / Win7 Ultimate x86 on laptop / Win7 x86 Starter on Netbook

Hi, have you checked for stray strands or just one strand of wire sticking out where the reset switch is connected to mobo. It could be touching something?
Also check the main power supply cable from your wall socket, it could be a loose wire?
If connected to a filter after the main socket check for loose wires also.
If you haven't got a filter it could be transient/spikes in the voltage from the main power supply in your home.

Hope this helps? :)
My System SpecsSystem Spec
27 Feb 2010   #40

Windows 7 Professional x64

Dwarf has asked us for more help, so let me throw in my suggestions. First, try reading these links.

I have been watching this thread since it was created, so rather than suggest what has already been tried, let's try another tactic.

Remove all hardware from the motherboard. DVD drives, video cards, hard drives, etc.

Actually, to make this as fail-proof as possible, remove the motherboard from the case as well.

You can leave the CPU and RAM attached to the motherboard.

Then put it back together. Use onboard graphics, keep all USB devices unplugged, and only leave 1 hard drive, the mouse, and keyboard attached.

See if the problem persists.
My System SpecsSystem Spec

 PC reboots if someone walk by

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