If it is a surge protector, then it often has two lights. This optional second light reports a defective safety ground. Always required first light reports protector circuits have disconnected to avert a house fire. Some glow when OK. Others glow when a failure has occurred. Consult the manufacturer's instructions.
A power strip typically has only one light to indicate power.
Both protector and non-protector strips, if minimally safe, feature a circuit breaker that disconnects all lights and receptacles.
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Sounds exactly like a ground problem. These are best left to experienced techs because the risk of electrocution is very real. Try the amp with a surge protector, and also on a different outlet... these two steps will determine if it's a problem with the amp or the wiring of the building you're playing in.
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