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Windows 7: PC reboots if someone walk by

26 Feb 2010   #21
Dwarf

Windows 8.1 Pro RTM x64
 
 

I mentioned the PSU tests because I was interested in whether the required voltage levels deviated from the nominal values when the system reset itself.


My System SpecsSystem Spec
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26 Feb 2010   #22
churin

W7 Ult x64 and W8 Pro x64
 
 

Quote   Quote: Originally Posted by Darryl Licht View Post
What case? contact the manufacturer... tell them you have a bad rest switch or wire harness... they should send you a new one. How old is case?
It is a computer case which I bought at a local computer shop about 40 days ago. So it's too late to return it to the retailer. The vendor may agree to replace it with another same model but I am not sure that would solve the problem, because I do not know what the cause of the problem is. Is it the mobo, the PSU or the case? Maybe this particular mobo is just not compatible with this case. Since I tested the hardware system without using the case as mentioned in my previous post, I am pointing to the case which being possible culprit.
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26 Feb 2010   #23
churin

W7 Ult x64 and W8 Pro x64
 
 

Quote   Quote: Originally Posted by Dwarf View Post
I mentioned the PSU tests because I was interested in whether the required voltage levels deviated from the nominal values when the system reset itself.
How can I access to those test points? It appears there is no way to do so.
My System SpecsSystem Spec
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26 Feb 2010   #24
Dwarf

Windows 8.1 Pro RTM x64
 
 

It involves a technique known as back-probing. Essentially, you probe the connections from the back of the plug (where the wires come out). See here for an illustrated description (scroll down to Measuring Voltage).

InformIT: PC Repair and Maintenance: In-depth Look at Power Supply > Power Supply Troubleshooting
My System SpecsSystem Spec
26 Feb 2010   #25
Darryl Licht

Windows 7 Ultimate 64 bit Steve Ballmer Signature Edition
 
 

Yeah Dwarf... it could be a low voltage/high voltage issue! Eliminate possiblities and test this.

As for testing the voltage churin, make sure you use a good DVM (digital volt meter) and use the blk probe to any blk wire (gnd)... the red probe down the wire whos voltage you want to measure from the back (while plugged in and on of course).

Oh yeah... if the DVM has several voltage settings keep in mind you should expect to find most voltages in the 3-13 volt DC range <--- set your dvm accordingly!
My System SpecsSystem Spec
26 Feb 2010   #26
Dwarf

Windows 8.1 Pro RTM x64
 
 

Another question. Did the case come with a PSU included? In many cases these are of inferior quality. Many people, including Scott Mueller (of Upgrading and Repairing PCs fame), recommend replacing these units with more reliable ones.
My System SpecsSystem Spec
26 Feb 2010   #27
Darryl Licht

Windows 7 Ultimate 64 bit Steve Ballmer Signature Edition
 
 

I taught A+ for years... always loved the Scott Mueller series! A great resource!

I agree with you again... a good quality power supply is crucial to all my builds, whether a workstation or gaming rig.

What is the make and model of your PSU churin?
My System SpecsSystem Spec
26 Feb 2010   #28
churin

W7 Ult x64 and W8 Pro x64
 
 

Dwarf;

I measured those voltages as follows:
Pin 7 - Pin 8: 3.7V and stayed unchanged with reset by electrostatic discharge.
Pin 15 - Pin 16: 0V and stayed unchanged with reset by electrostatic discharge.

The PSU did not come with the case. It is BFGR550WGXPSU
My System SpecsSystem Spec
26 Feb 2010   #29
Darryl Licht

Windows 7 Ultimate 64 bit Steve Ballmer Signature Edition
 
 

Sounds like 15 & 16 are giving a bad voltage... 0 vdc.
My System SpecsSystem Spec
26 Feb 2010   #30
Dwarf

Windows 8.1 Pro RTM x64
 
 

@Darryl:

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?

@churrin:

The PSU sounds OK, and the voltages are within the required tolerances.

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.
PC reboots if someone walk by-capture.png


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 PC reboots if someone walk by




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