Envy 14 1095la. High pitched whine sound and fan cycling.

Hi. I'm in contact with the customer service about 2 (and a 3rd maybe related) annoyances I have on my Envy 14 1095la (XC515LA#ABM) notebook. I want to share them here in case someone has some clues and guidance about them.
Fan cycles continously on and off every couple of seconds
... on light usage (using the low performance GPU and a text editor).
Reading the temps using Coretemp and HDinfo, I can hear the fan kicking in when CPU temp is above 35º and turning off when it reverts back to this value.
Enabling the "FAN ALWAYS ON" option on the BIOS (as suggested by the tech guy) has no effect over the problem (yes, the fan remains always on, but you can still hear it cycling RPM constantly).
Since this model has no option to regulate the FAN via software, the only solution seems to be a BIOS upgrade.
Sometimes, I can hear a high pitched sound coming from the computer.
Tech guy suggested me to experiment a bit with this to better understand what can be the problem. I've found so far:
Seems to be far more frequent if the battery is in place (without the battery I heard it only once, and quiet).
Seems to be more louder if the battery is in use.
The sound seems to originate from the Seagate Momentus HD, but It is so high pitched that makes difficult to point the exact origin.
Messing with the sound options (muting mics, audio etc) seems to have no effect.
Sometimes I feel a strong vibration on the palmrest
Perhaps related to the previous, sometimes I can feel a strong vibration on the right palmrest.
Resting the notebook over different surfaces (or lifting it in the air) seems to have no effect.
Reading a bit on this forum I can see that  the Seagate Momentus HD is a strong candidate for the vibration+high pitched sound problem, but again, if anyone has a better idea or an aditional test I can made to be sure, is welcomed.
Thanks!

Well, notebook is out for repair.
I've in touch with a level 2 support guy that acknowledged that the "fan cycling" thing is odd and will pass a report to the engineer team (hope HP is not lazy because the Envy refresh and new BIOSes).
About the high pitched noice and vibrations, they will check the HD, but since SMART values are alright, I doubt they´ll change it.

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