Every USB port on my desktop tower gives me a noticeable shock when I touch the exposed connector. I also feel it through my guitar strings when the guitar is connected for recording. This happens with different USB ports and devices, so I suspect a grounding or power problem. What should I check, and how can I fix it safely?
3 Answers
The problem may be with the wall outlet or building wiring rather than the computer itself. Try not to move the PC around while it’s connected, and don’t add an improvised grounding wire. If the outlet is properly wired, the power supply and its cable should be inspected and possibly replaced after testing.
First determine whether it’s a single static zap or an ongoing tingling sensation. A one-time snap is usually static discharge, but a continuous shock means the computer’s metal parts may be energized. An inexpensive outlet tester can reveal a missing or miswired ground, though it doesn’t replace professional testing.
Stop using the computer immediately, switch it off, and unplug it. A continuous tingle or shock can indicate leakage current, a failed power supply, or a missing protective earth. Don’t keep testing it by touching the connectors, and have the outlet and PC checked by a qualified electrician or technician before using it again.
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