After a power failure, my DGS-1024D wasn't turning on anymore. I too had this buzzing noise from the PSU. Replaced capacitor C12 and it did it!!
Don't know how you guys figured out it was this cap since it was impossible to tell by looking at it!! Once removed, the tester confirmed there was no more capacitance, only resistance. I replaced it with one that is more chubby (105C) so I hope it will be less prompt to failure.
Thanks again to those who found and posted that info, it saved my switch!
Laurence
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