August 9th, 2013
I am having problems with my usb ports after a power supply change. When i turn on the pc the ports sometimes works but when i plug in another usb device after it has booted-up all just stop working at once.. Then when try to restart i can’t even use my keyboard to go in bios etc… I then need to remove the power cord for like 10mins to get them to work agen; but same things happens everytime when i plug a new usb device.. they just all stop working… Any help? Is this a prob with the power supply itself? Too low voltage maybe idk…
Answer #1
You could have low volts or an inadequate current capability on the + 5V Standby rail coming from the power supply.
Check the voltage on Pin 9 of the mobo connector..Make sure the plug is in tightly and making good contact..
http://en.wikipedia.org/wiki/Power_supply_unit_%28computer%29
If things were OK before you changed the PSU, then it would tend to make that the culprit.
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