Envy 7640 makes chirping noise, as does replacement

Sorry for the RANT!
Bought Envy 7640 and noticed audible chirping noise from power unit. Researched forums etc and found it is a common problem. Contacted HP support (very hard to find) and spent hour explaining to agent including links to forums/youtube of noise etc etc.
No problem he says - send you a new power unit
Are you sure as this doesnt appear to solve the problem say I
Oh yes says agent this will work.
Complete new printer arrives and problem is exactly the same.
I now have to waste more time getting UPS to pick up a second printer - what a complete and utter waste of my time and HP money
Dont see i have a choice but to take the printer back to the shop and buy another brand, cancel the ink package and start again.
Can i find the support contact details again - can i ****
Unless anyone can help me on this forum i will NEVER EVER go near another HP product as long as my arse points the floor

I have brought your issue to the attention of an appropriate team within HP.
They will likely request information from you in order to look up your case details or product serial number.
Please look for a private message from an identified HP contact.
Additionally, keep in mind not to publicly post serial numbers and case details.
If you are unfamiliar with how the Forum's private message capability works, this post has instructions.
Also our technical support is reached at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Aardvark1
I work on behalf of HP
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Please contact HP Support and request a new power supply. The power supply is customer replaceable and can be easily removed by one screw.
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Please click "Accept as Solution" if you feel my post solved your issue, it will help others find the solution.
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“Please click the Thumbs up icon below to thank me for responding.”
RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

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NOTE: You may have to use the above cached link to access the Printer's Support pages today. The direct search link from Driver and support might be glitchy. This is primarily relevant when / if you need to install the Full Feature Software for the Printer to find the Driver's page.
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Envy 7640 makes chirping noise, as does replacement

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