I'm stumped

[emilyek]

About a month ago, the computer in my signature below started having problems. The mouse and keyboard-- both USB-- would cut in and out; it got to the point where the computer became unusable.

I figured it was time to build a new one, so I put together an AM3 system that re-used the old PSU, GPU, monitor and mouse.

(Since all my USB devices were doing it, including another mouse I had when I plugged that in, I decided to keep the one mouse, which is a pretty new IE. 3.0.)

I also upgraded from Windows Vista to Windows 7.

After putting this new machine together-- the USB does the same thing.

Power supply-- right? Wrong. I ordered a new one of those, and it still does it.

Swapping USB mice has the same result-- both USB mice cut in and out. (I am currently using an old PS2 keyboard that has had no issues.)

So: the only components left over from my original computer is the GPU and the monitor (and the mouse, of course)-- and the problem persists.

Is there any way that either one of these is the source? Could the GPU be causing this? Could the monitor be giving off RF interference or something?

Anyone experienced anything like this?

 

[DaveSimmons]

Are the mice wired or wireless? RF wouldn't affect a wired mouse.

Are you using the back motherboard USB ports or a case port that could be bad?

 

[Puppies04]

My moneys on a bad case port connector

 

[emilyek]

It's a new motherboard, and case.

And all the USB devices-- Logitech G15, Razer Tarantula Keyboard, and old Razer Diamondback and a New MS IE 3.0 are all wired.

Does a GPU use the same rail as USB devices? Could a weird monitor or monitor cable be causing interference of some kind?

Because unless all these devices got the same weird issue at the same time somehow, I can't fathom what else could be causing it.

 

[JuanJeremy]

obviously you have a ghost in your house that is unplugging your mouse when youre not looking

 

[mfenn]

Does your new mobo have an IGP? You could try pulling the GPU out entirely to see if that solves the problem (though I am having a hard time fathoming why it would). Also, have you tested the USB devices (at length) with a different computer?

 

[Zap]

Does a GPU use the same rail as USB devices?

No. GPU uses +12v and USB uses +5v. In fact, PSUs have a separate +5VSB that some USB ports on your motherboard might use.

 

[emilyek]

Does your new mobo have an IGP? You could try pulling the GPU out entirely to see if that solves the problem (though I am having a hard time fathoming why it would). Also, have you tested the USB devices (at length) with a different computer?

No on-board video.

I actually also re-used my old X-fi sound card; I've run with it with on-board sound disabled in bios, and without anything at all-- no card no bios, and the USB would still cut out.

The only thing I can think of is maybe this mouse IS bad, and it is somehow affecting other devices, even after it has been disconnected. That doesn't seem likely at all to me, but I don't know what else to think.

Maybe I'll just buy a cheap new usb mouse to test.

 

[Puppies04]

Does it do this when the only USB devices you have plugged in are your kb and mouse? I tried a little googling and found someone who had the same type of issue and it was being caused by their printer.