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I recently got a brand new computer. Everything was fine until I plugged my electric guitar into my amp. When I switch on my guitar amp (guitar speaker) I can hear a weird noise. It sounds like the noise that that goes through your speakers when you put your mobile phone next to it.

There is nothing wrong with my guitar or guitar amp and I didn't have any similar problems with my old computer. Can anyone help me?

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More information is necessary: what does the computer have to do with your guitar amp? Are you using the computer as a guitar amp? – Shannon Nelson Dec 27 '10 at 2:31
@Shannon Nelson computer as a guitar amp? I would like to see that one... – ubiquibacon Dec 27 '10 at 3:24
Do you hear the strange noise from the amp, or from your computer's speakers? – sblair Dec 27 '10 at 3:37
i hear the noises from my guitar amp.. – Mury Dec 30 '10 at 15:17
up vote 0 down vote accepted

TheLQ is correct, but to be more specific in your case the amp is "receiving" a rouge signal from somewhere. If your amp is not connected to your computer in any fashion then I would first make sure the outlets you are using are properly grounded (three holes instead of two). Do not use one of those little gray adapters for your computer or your amp. If the outlet(s) you are using are properly grounded then the most likely source of the sound is from a wireless device somewhere. It could be a cell phone, a cordless phone, a bluetooth adapter, a wireless router, etc. Start unplugging wireless devices one by one until you locate the source, then remedy as you see fit.

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Or it could have been a neighbor's device. – AndrejaKo Dec 27 '10 at 3:44
@AndrejaKo that is possible, but unlikely I think. It is more likely that the device in question is within close proximity. – ubiquibacon Dec 27 '10 at 4:29
i dont have any wireless device at home and that weird sound starts when i start my computer ...actually when i turn on my computer it shows the motherboard's brand (NO weird noise coming from my amp at that point) and when it starts booting from hard disk, it starts to making that noise... and i put my old hard disk then try again (which was working perfectly) but nothing changed... – Mury Dec 30 '10 at 15:33
@Mury you don't have ANY wireless devices? Cordless phone? Wireless mouse or keyboard? Bluetooth or WIFI enabled motherboard? Also, is your amp connected to your PC in any way, shape, or form (with USB cable, 1/4" stereo cable, 1/8" stereo cable, etc.)? – ubiquibacon Dec 30 '10 at 23:04
y amp not connected my computer .. and today i realized that, when i go away from my computer with my guitar, that noise is goes away too ....if i go out of my room with my guitar there is no weird sound(just my guitar sound coming from my amp).. but when i sit in front of my computer with my guitar that weird sound stars again.. i think my guitar works like an antenna ... Btw on electric guitars there are magnets (pickups) maybe the pickups picking up the sound? – Mury Dec 31 '10 at 5:09

Its probably EMI (Electromagnetic Interference). This happens with cell phones and anything else that puts out a signal. In your case, its your guitar amp which is probably leaking electricity or other signals, which get picked up on your speakers.

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