Audio problem with USB cable connected

[scottp]

So I have an Axe-Fx II XL+ running 9.04.
When I have the USB cable connected from laptop (PC) to the Axe I get the noise.
It sounds like occasional popping, spitting or crackling noises.

Like if you hit an E chord and let it ring out, that is when you can really hear it.
I tried it with Axe-Edit open and connected, paused, that didn't make any difference.
But when I disconnect the USB cable from the laptop, the noise goes away!

Any idea how I can eliminate the noise?
Am I missing a setting somewhere?

I am not recording and do not have anything else plugged into the laptop. No other programs running.
Thanks.

 

[Billbill]

Running USB will cause a slight jump in CPU. Check your preset CPU level. If in 90's this will happen

 

[Birdy]

Have you tried a different cable or even a different computer?
What happens if the USB is plugged in but the computer is turned off?

 

[hotlegs]

Check cpu load