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System won't post - usb device over current status detected


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#1 bdearen

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Posted 21 July 2013 - 05:27 PM

Hey everyone I have never posted here because I have not needed to yet.  I have been working on computers for about 10 years so I have a lot of knowledge.  Today I received a computer in that wouldn't boot.. wouldn't even post.  I tore the computer down to just the motherboard, 24 pin power and 4 pin (cpu) power and the monitor into the onboard graphics.  I got the computer to post but it showed the error below.  I have looked through tons of forums to find that it's as I expected usually caused by the front usb ports plugged into the motherboard or a dirty or bent usb port.  I cleaned out the usb ports on the board and as far as I can tell there is no debris or problems with them.  All that's plugged into the board is power and one piece of ram and I am getting this error. I have tried everything I can think of can anyone assist?  The motherboard is running outside of the case right now but gives the same error screwed down to the case or out of the case.  This motherboard has a jumper to clear CMOS I tried that.  I even took out the battery to try reseting that way.  This error is given with or without the keyboard plugged in.
 
ASUS P7H55-M/CG5275/DP_MB
 
auto-detecting usb mass storage devices
00 usb mass storage devices found
no keyboard
usb device over current status detected
system will reboot.
 
 
ASUS_P7H55-M_CG5275_DP_MB.jpg

 



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#2 dicke

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Posted 21 July 2013 - 06:46 PM

Hi,

About the only thing left is the motherboard. Have you carefully checked both sides of all of the USB connection points to be sure that nothing is shorting any two points together? If the surfaces are clean the lastplace to look before replacing the board would be for cracks/scratches which could be causing the condition.

Keep usposted


Stay well and surf safe [stay protected]

Dick E


#3 bdearen

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Posted 21 July 2013 - 06:53 PM

Hi,

About the only thing left is the motherboard. Have you carefully checked both sides of all of the USB connection points to be sure that nothing is shorting any two points together? If the surfaces are clean the lastplace to look before replacing the board would be for cracks/scratches which could be causing the condition.

Keep usposted

 

The USB connections are on the board see the link below for the pic.  There is no place I can see they are connected to the board at.  I looked inside the actual USB ports and they all look normal I can't see anything going on there.  The customer told me they had to replace a keyboard because it "shorted" out when plugged in to the comp.  Said the comp wouldn't boot when the old keyboard was connected.  Also said a ram stick shorted out a while ago as the comp wouldnt' boot until they removed one of the 4 sticks of ram.

 

http://www.asus.com/Motherboards/P7H55M/



#4 dicke

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Posted 21 July 2013 - 08:22 PM

Interesting,

The USB board connections are solder points on the bottom side of the board.

The keyboard 'shorted' the RAM 'shorted' have you checked voltages? The power supply may be faulty.

Keep us posted


Edited by dicke, 21 July 2013 - 08:23 PM.

Stay well and surf safe [stay protected]

Dick E


#5 bdearen

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Posted 22 July 2013 - 09:09 AM

Interesting,

The USB board connections are solder points on the bottom side of the board.

The keyboard 'shorted' the RAM 'shorted' have you checked voltages? The power supply may be faulty.

Keep us posted

Could you explain how and where to check voltages?  I normally just swap in a working powersupply if I suspect a faulty one and see if that solves the problem.  



#6 dc3

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Posted 22 July 2013 - 09:36 AM

Reading Desktop ATX Form Factor PSU Rail Voltages
 
Caution: Please read this before continuing.
 
 

  • Since it will be necessary for your computer to be on during this procedure, you need to be aware that you will be working with live 12Volt DC potentials, which if handled improperly may lead to electrical shock. 


  • There are electronics inside the case that are very susceptible to electrostatic discharges. To protect your computer, touch the metal of the case to discharge yourself of any electrostatic charges before touching any of the components inside.


  • If you are not comfortable doing this procedure, then I would suggest that you not use this tutorial. The risks involved are minimal, but are there nevertheless. Anyone who uses this tutorial will be doing so at their own risk.

 
There are two devices commonly used to read the rail voltages: a PSU tester, and a multimeter. 
 
The PSU tester is the easiest to use since all that is necessary is to plug the different connectors into the tester and read the results on the LCD display. The problem with most of these is that they only perform a pass/fail test.  They will not provide you with actual voltage readings.
 
There are a variety of multiple meters, but this tutorial will address Analog and Digital multimeters. The advantage of these meters is that you will be able to obtain accurate real time voltage readings.
 
For those of you who wish to know more about multimeters there is an excellent article in Wikipedia.
 
 
Analog Multimeter
 
th_analogedited.jpg
 
 
An Analog multimeter is a little more complicated to use. Both Analog and Digital multimeters need to be set to the appropriate voltage, but with an Analog multimeter, you will need to choose the voltage range and must read the proper scale. 
 
The Analog multimeter uses a needle display which moves from 0 across the scale until it reaches the voltage being tested. This multimeter has five major linear divisions with multiple scales to read a variety of ranges. An example would be three different ranges. The first is graduated in increments of 0 through 5, the second, 0 through 10, and the third, 0 through 25. Each of these ranges are subdivided into divisions that are graduated into tenths. In order to read 12 volts the 0 through 25 range would be the appropriate one. 
 
Because DC voltage has positive and negative potentials this device is polar sensitive, this means that if you reverse the two probes when reading a positive DC voltage it will read as a negative voltage. This is actually necessary to read negative DC voltages. The two probes are differentiated by their color, Black (negative), and Red (positive). To read a positive DC voltage, the correct probes must be used with their corresponding potentials (positive to positive and negative to negative). 
 
With the probes being used normally to read a negative DC voltage, the needle moves from the 0 to the left, "pegging" the needle. By reversing the probes you can properly read the negative voltages.
 
Digital Multimeter
 
th_digitalmeteredited.jpg
 
 
The Digital multimeter (DMM) is much simpler to use. As was mentioned previously, you will need to set the appropriate voltage. One of the advantages is that the DMM has an LCD display with a numeric readout, so there are not any multiple scales to read. Another advantage is that most DMMs are autoranging when reading voltages, which means that you will not need to set the range with these DMMs. A DMM will read both positive and negative DC voltages and display them correctly. When reading a negative voltage, a minus sign will appear on the display before the numeric value. This still is a polar sensitive device, so you will still need to use the positive and negative probes with their corresponding potentials. 
 
There are five different DC rail voltages which are color coded. The Black wires are always negative.
 
Yellow +12VDC
 
Blue -12VDC
 
Red +5VDC
 
White -5VDC
 
Orange +3.3VDC
 
There are only three voltages that can be measured easily without disconnecting the 20/24 pin connector from the motherboard: +12V, +5V, and +3.3V.
 
The +12V and +5V voltages can be read from a four pin Molex power connector.
 
Four pin Molex power connector
 
th_250px-Molex_female_connector.jpg
 
 
The same voltages can be taken from a four pin SATA power connector, but in order to read the +3.3V you will need to read this from a five pin SATA power connector as seen below.
 
Five pin SATA power connector.
 
th_sata-power-cable.jpg
 
To read these voltages you will need to insert the Black (-) probe into any of the black  sockets, and insert the Red (+) probe in the different colored voltage sockets.   To read the voltages from a SATA power connector it is easiest to insert the probes into the bac k of the connector where the wires enter.  Unfortunately the sockets of the modular SATA power connectors are not accessible from the back, so the readings will need to be made from the socket side.  Some probes are going to be too large to fit in these sockets, so you may need to insert a piece of wire into the socket of which you want to read the voltage of and place the probe on this for your reading.  To reduce the potential of creating a short I would suggest taking the ground potential from another connector so that the two wires will remain physically separated.
 
Caution:  It is very important to make sure that you don't allow the two probes to touch each other when taking the voltage readings.  This will cause a short which could damage the PSU or other components.
 
To get accurate readings of the rail voltages it is important that there be a load on the PSU. In order to do this I would suggest downloading Prime95 for this purpose. This program was designed to be used by overclockers to put a full load on the RAM and CPU to determine the stability of their overclocking.  Because of this it will put stress on the CPU and RAM which will create higher than normal temperatures.  For this reason I would suggest not running this program any longer than is necessary.  I would also suggest that an inspection be made of the interior of the case to make sure that there isn’t an accumulation of dust which would impede adequate cooling.  Pay special attention to the heat sink and fan assembly on the CPU.  If there is a dedicated graphics card with a fan installed on it, look at this fan as well.      
 
 
Readings should not have variances larger than +/- five percent.  
 
Maximum.........Minimum
12.6V.................11.4V
5.25V.................4.75V
3.47V.................3.14V

Edited by dc3, 22 July 2013 - 09:41 AM.

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#7 dicke

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Posted 22 July 2013 - 11:43 AM

 

Interesting,

The USB board connections are solder points on the bottom side of the board.

The keyboard 'shorted' the RAM 'shorted' have you checked voltages? The power supply may be faulty.

Keep us posted

Could you explain how and where to check voltages?  I normally just swap in a working powersupply if I suspect a faulty one and see if that solves the problem.  

 

Hi,

That's my usual method as well.

The tutorial posted is excellent and I plan to put a copy in my files to use as reference and to pass on to others who may benefit from it.

Keep us posted


Stay well and surf safe [stay protected]

Dick E


#8 dc3

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Posted 22 July 2013 - 11:58 AM


 

 

Hi,

 

 

That's my usual method as well.

The tutorial posted is excellent and I plan to put a copy in my files to use as reference and to pass on to others who may benefit from it.

Keep us posted

 

 

Thank you for the compliment, I enjoyed writing it. :thumbup2:


Family and loved ones will always be a priority in my daily life.  You never know when one will leave you.

 

 

 

 


#9 dicke

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Posted 22 July 2013 - 12:41 PM

 

 

Hi,

 

 

That's my usual method as well.

The tutorial posted is excellent and I plan to put a copy in my files to use as reference and to pass on to others who may benefit from it.

Keep us posted

 

 

Thank you for the compliment, I enjoyed writing it. :thumbup2:

You are most welcome. I will have to remember to make the proper attribution :)


Stay well and surf safe [stay protected]

Dick E





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