can you return it ?
Yes. I have to it seem.
You sure its not coil whine? Some PSUs with some miners or GPUs having bad coil whine.
Well it does the noise even before the miner start mining, at minimal load. And it shut down itself after a few hours, now.
can you return it ?
On newegg getting a replacement is really easy on RMA in most cases. Not sure how easy it will be to get a flat return though.
It was refurbished so i'm not quite sure what they will send back but i hope i have some kind of revision with the RM850 fixed, otherwise i won't be able to mine much with it heh.
you may get a refund it should tell you in the RMA or return policy, most refurbished stuff is refunded from new egg at least for me it has been refunded back, no replacement.
i have two of those PSU, i got really good deals on a while back off Amazon Warehouse, Ive had mine for all most two years now with no issues.
my two came out right after the bad ones did so i was luckily i guess .!!!