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yes ive tried all sorts of things to see where its coming from and nothing seems to match
and no no serial number
i dont think its the mains, as it seems to be coming from the other side of the laptop, not the jack end.
the item was sent back to very so unless they have a tech dept who checked it over it would have then been sent to HP - it was about a week, before the new one was ordered, and a further 3 days for it to be at Very - so possibly enough time for them to check it and just prepare to resell ...??
i dont know if VERY have the machines with them and send from their own warehouse or order from the manufacturers to send to them THEN to send to customers...
if the latter then maybe its too short a turnaround - but it seems odd that HP would be out of stock, but not very - unless this is a known problem with this model and they have had loads of returns ...