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What's the amperage of your new power supply? My estimate is, that it needs at least 0.8A at 9V DC.
But the fact it worked for 6 months, makes me think that something else is the problem.
I've been using my microkorg XL for a couple of years now without any problems. I changed my power adapter about 6 months back, which is a lower amperage than the original one. It did work with the ne ...