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1. Check the power cable and ensure it is securely connected to both the amp and the power outlet.
2. Check the fuse and replace it if needed.
3. Check the power switch and ensure it is in the correct position.
4. Check the battery (if applicable) and replace it if needed.
5. If the amp is still not turning on, contact Roland customer service for further assistance.
If the third prong is the round one, then that is the ground to your amp. It will still work, however, the amplifier will not be properly grounded. So in a pinch you can use it, but you need to get the cable replaced. The ground wire is there for your safety, in case you plug your amp into a mis-wired outlet or if you are plugging in another instrument like a keyboard, mixer etc. that may be mis-wired. This could lead to a bad shock or worse. You have been warned.
Try a ground lift on the audio desk Im guessin it phase issue ground lift is a small grey or orange 2 prong mail and 3 prong female any hardware store will have them...FYI
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