Connecting to USB port shuts off computer

[Guest Digger]

This just started happening about a week ago. When I try to connect my iPod

or cell phone via their respective cables to the USB ports the computer shuts

off. I've done a system restore and checked the Device Manager and nothing

seems to have the answer.

[Guest philo]

Re: Connecting to USB port shuts off computer

 

 

"Digger" <Digger@discussions.microsoft.com> wrote in message

news:D1EE029D-9E90-49D7-B38D-6AF4C22A4343@microsoft.com...

> This just started happening about a week ago. When I try to connect my

iPod

> or cell phone via their respective cables to the USB ports the computer

shuts

> off. I've done a system restore and checked the Device Manager and

nothing

> seems to have the answer.

 

 

 

I've seen that due to static electricity...

especially on ECS motherboards

[Guest Jim]

Re: Connecting to USB port shuts off computer

 

 

"philo" <philo@privacy.net> wrote in message

news:ONCQovNLJHA.5648@TK2MSFTNGP05.phx.gbl...

>

> "Digger" <Digger@discussions.microsoft.com> wrote in message

> news:D1EE029D-9E90-49D7-B38D-6AF4C22A4343@microsoft.com...

>> This just started happening about a week ago. When I try to connect my

> iPod

>> or cell phone via their respective cables to the USB ports the computer

> shuts

>> off. I've done a system restore and checked the Device Manager and

> nothing

>> seems to have the answer.

>

>

>

> I've seen that due to static electricity...

> especially on ECS motherboards

>

>

And, if it is static electricity (which seems highly likely), your only

recourse is to proceed as follows: Disconnect every thing from the

computer. Unplug it from the convenience outlet.

Press the start switch. Connect everything back to the computer. Plug it

back into the convenience outlet. You are now ready to try operating the

computer.

 

Jim

[Guest GlowingBlueMist]

Re: Connecting to USB port shuts off computer

 

"Digger" <Digger@discussions.microsoft.com> wrote in message

news:D1EE029D-9E90-49D7-B38D-6AF4C22A4343@microsoft.com...

> This just started happening about a week ago. When I try to connect my

> iPod

> or cell phone via their respective cables to the USB ports the computer

> shuts

> off. I've done a system restore and checked the Device Manager and

> nothing

> seems to have the answer.

 

It sounds like the power supply is dying. When you use the USB port it

passes the 5 volts from the power supply to the external device. The extra

load from the external device is pushing the power supply just enough to

make it go critical and shutting down.

 

One last thought is to try another USB cable in case the one you are using

is shorting out the 5 volts.

[Guest Paul]

Re: Connecting to USB port shuts off computer

 

Digger wrote:

> This just started happening about a week ago. When I try to connect my iPod

> or cell phone via their respective cables to the USB ports the computer shuts

> off. I've done a system restore and checked the Device Manager and nothing

> seems to have the answer.

 

You are overloading +5VSB coming from the power supply. If the motherboard

is old enough, there will be a USBPWxx jumper header, where you can

switch between using +5VSB or +5V for the USB port. +5V has more amps

to offer, so using +5V will not cause the computer to reset.

 

The +5VSB not only powers part of your computer, but is also

part of the "PS_ON#" signal from motherboard to PSU. If +5VSB

is flattened (by being shorted), then the power supply will

switch off.

 

The iPod may be attempting to draw battery charging current.

As a test, you can try plugging something other than an

iPod, such as a mouse, as it only draws 100mA or less. If

the computer stays running, then you'd have a suspicion

that either the power supply is weak, or something else

in the computer is using more than its share of +5VSB.

The +5VSB rating is printed on the label on the side

of the power supply. My brand new supply, is rated for

+5VSB at 3 amps, a bit stronger than the old supply.

A motherboard might typically use 1 amp while the

computer sleeps, from that rail, but modern

motherboards also run the USB ports from that

rail, and that could potentially lead to an

overload, if you have stuff like USB scanner,

USB ADSL modem, iPod or other stuff that are

known current hogs.

 

Paul