Hi,
A colleague has a PC which has been working OK, with both front & rear USB ports.
When any USB device is connected, the computer powers down with out warning.
My first thought was the onboeard USB, so a PCI USB card was fitted and the problem still existed.
My colleague has a standard USB extension cable.
If a memory stick, ipod etc is connected to the PC via the extension cable then the device works OK.
If a printer is connected via the extension cabe then he gets a device installation error, if the printer was connected with out the extension cable the PC would power down.
If the printer is connected and the the PC is switched on windows will startup and once the printer is found as a new device, the PC again powers down.
We then uninstalled the USB ports and drivers and rebooted to reinstall the ports and the printer still causes the PC to power down.
I posted this query on MS newsgroups and got several replies suggesting it was a power supply problem.
The power supply was then changed and the problems still exist.
So if the printer is connected to the PC directly it shuts down, if it is connected via an extension cabe there is an unrecognised device error.
Plugging a memory stick etc directly into the PC causes the PC to shut down, but connecting a memory stick via an extension cable the device works ok.
Any suggestions?
Thank you.
USB problem