pc hang when usb connect

Micro-star international / 7191
April 2, 2009 at 08:14:58
Specs: Windows XP
i have the problem of usb that when i connect to pc than pc hang to connect of pendrive or connect usb keyboard & mouse then in screen i get the message of usb is not recognized. i aslo formatted the pc then also the same problem .
please help me

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April 2, 2009 at 10:08:06
If you reformatted the machine, you need to reinstall the chipset drivers for your mobo. Also you will need at least service pack 1 installed.

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April 2, 2009 at 12:09:20
The USB controllers must be enabled in the mboard's bios Setup settings

USB devices may not work properly when plugged into certain USB ports, and/or you may have an IRQ sharing problem you need to fix.
See response 3 in this:

Your mboard has hardware that supports USB 2.0, which also supports USB 1.x.
Windows Setup as is will automatically detect the USB 1.1 support, but you must install the mboard chipset drivers, and at least XP SP1 updates must be installed in Windows, in order for Windows to detect the USB 2.0 support and install the drivers it already has built in for that.
However, even before the USB 2.0 drivers are installed the devices plugged into USB ports should work, if they are plugged into a port they should work fine in, according to the info above.

Whenever you load Windows from a regular Windows CD (or DVD) from scratch, after Setup is finished you must load the drivers for the mboard, particularly the main chipset drivers, in order for Windows to have the proper drivers for and information about your mboard hardware, including it's AGP or PCI-E, ACPI, USB 2.0 if it has it, and hard drive controller support. If you have a generic system and have the CD that came with the mboard, all the necessary drivers are on it. If you load drivers from the web, brand name system builders and mboard makers often DO NOT have the main chipset drivers listed in the downloads for your model - in that case you must go to the maker of the main chipset's web site, get the drivers, and load them.

Your mboard model may have a header on it for a firewire connection - it's either standard or optional.
If it does, that header is right beside the headers on the mboard for connecting a pair of USB ports.
If you connect the wiring for a USB port or a pair of USB ports to the header for firewire, or visa versa, you don't have a problem unitil you plug in a device that is connected by wiring to the wrong header, but when you DO plug in a device into the mis-wired port, ALL HELL BREAKS LOOSE and you can damage the circuits for firewire or USB or even other mboard circuits, AND the device you plugged in, in a short time!!

Which pin is for what on a USB header on a mboard, and which wire is for what in a one piece multi wire female connector from a USB port, was never standardized. You must make sure any female wiring connectors you connect to the pins on the mboard header have the right pins connected to the right wires.

If you don't have the mboard manual, there are two main MS-7191 mboard versions, and several sub models depending on which optional componentsthe mboard has.

MS-7191 Version 1.2 Downloads
a.k.a. RS482M4-FD/ ILD/ IL/ L

MS-7191 Version 1.3 Downloads
a.k.a. RS482M4-CSIP

Some older MSI mboards can develop the bad capacitor problem.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:

What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:

You will have problems with USB if your power supply is defective and is no longer putting out enough of what is supposed to be an accurate +5v .
However, if you have that problem, your floppy drive, optical drive(s), PS/2 ports, and serial ports won't work properly either.
Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:

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