USB Devices stopped working on computer

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JFresh

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Joined
Jun 11, 2004
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161
Hey all,

Got a head scratcher here and hoping I can get some help or insight.

Turned on my computer today and the USB ports all refuse to work. This means no keyboard, no mouse, no nothing. However, the computer DOES power on! And the OS (Win10 Pro 64) has no problems coming up at all.

Here's what I've done so far:

Tried other USB devices that are known to work on the second (let's call it Good) computer, but they don't work on here.

The USB devices that were originally connected to the problem (Bad) computer DO work on the Good computer.

It seems clear the devices themselves are fine.
--

I use a Razer Naga mouse so it lights up when it's plugged in on the Good computer. But it does NOT light up on the Bad computer.
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This leads me to suspect that it's either the motherboard or the PSU. But because both are otherwise functional it's tough to tell which one it is.
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I have tried disconnecting all USB devices and leaving only the keyboard plugged in but no dice.

Oddly enough - every now and again - and purely on luck - I can get the keyboard to work and get me into BIOS where it will work. But as soon as you exit the BIOS it immediately stops working - even if I were to immediately reboot the computer. It's dead again.

I have tried switch off the PSU and unplugging it for several seconds but to no avail.

Also, the USB inputs on the front of the computer do NOT work either.

--

All this leads me to believe it's either the PSU or the Mobo (though I'm leaning towards the mobo). Still - before I run out and drop a couple hundred dollars on a mobo I thought I'd pick people's brains here to see if anyone can offer insight or suggestions on how to narrow down the problem.

Thanks for any and all help!

JFresh
 
Joined
Jan 7, 2014
Messages
2,679
Please provide as much detail about your computer as possible.
Need to know the, Operating system, motherboard , is it a manufactured computer (like dell) or custom build ; ie exact MB, exact CPU, exact GPU, Monitor cable, exact ram, exact pw supply, etc. Do not post 16gig of ram; post the exact brand and mode/part# do that for ALL of your parts. If you can get into the BIOS again, make sure Legacy USB is turned on. If it is an old PC, Bad capacitors can cause problems like that. Also if you have Windows 10, an update could have installed the wrong drivers making it not work. Can you get into safe mode? (F8 while booting)
 
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