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I've never encountered an issue as strange as this...

post #1 of 6
Thread Starter 
I just finished building a new PC (see sig for details). After using the computer for a few days I started to notice that anything plugged into the USB ports on my case would suddenly go offline for no apparent reason. To fix this problem I'd have to unplug the device and plug it back into the port and it would go back to working exactly as it should. I spent countless hours trying to troubleshoot this intermittent issue but no luck. However, today I actually found a way to reproduce the problem and I seriously can't even begin to figure out what's going on. So here's how I can reproduce the problem: If I turn on and then back off the exhaust fan in a completely unrelated downstairs bathroom the USB ports will stop working on my 900D case... WTH?! Seriously, how can an exhaust fan located in a bathroom in a completely separate part of the house cause my USB ports on my case to stop working?!

I'm usually good at troubleshooting issues but this issue has me questioning my sanity... LOL. headscratch.gif
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post #2 of 6
Hi powered fan motors like those found in a bathroom exhaust create a large EMI pulse. This is, for instance, why a lot of people will experience a pop through their speakers when the air conditioner comes on.
post #3 of 6
Thread Starter 
Quote:
Originally Posted by electro2u View Post

Hi powered fan motors like those found in a bathroom exhaust create a large EMI pulse. This is, for instance, why a lot of people will experience a pop through their speakers when the air conditioner comes on.

Ahh... that makes sense. Do you think a line conditioner would fix this issue?
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post #4 of 6
I'm out of my depth at that point. Does an APC UPS count as a line-conditioner? I recently moved and the pop I get with air conditioners is a whole lot quieter now, but still there.

You can try using a different outlet for the system if possible. I don't think there's anything to be worried about but it means there's a weak ground or something somewhere.

But yeah, there might be a little device you could use to even out the current enough to keep it from knocking out the USB ports (I've had this happen before too... and I did not know what it was until you made this thread lol).
post #5 of 6
Your fan is likely not grounded properly. Not really a great situation.
post #6 of 6
Thread Starter 
Ugh... my house was built just last year and conveniently the warranty period just expired. I guess maybe I should get an electrician out and if its a negligence issue approach the builder about getting reimbursed.

I researched line conditioners and I found one on Amazon that seems promising. Here's a link: click. I noticed one of the reviews mentions a very similar issue and the device fixed it for them. I guess I'll give it a try and see what happens.
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