It needs a new power cable. It was checked out by a local music store and it works well.
The item "Boss GT-8 Guitar Effects Processor Multi Effect Pedal COSM Needs Power Cable" is in sale since Saturday, August 31, 2019. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Multi-Effects". The seller is "kob3" and is located in Gainesville, Florida. This item can be shipped to United States, Canada, United Kingdom, China, Mexico, Germany, Japan, France, Australia, Russian federation, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Bahamas, Israel, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Belize, Dominica, Saint kitts and nevis, Barbados, Bangladesh, Brunei darussalam, Bolivia, Egypt, Iceland, Cambodia, Sri lanka, Luxembourg, Macao, Maldives, Nicaragua, Pakistan, Paraguay, Uruguay.