|Did your examine the mboard to see if it has one or more failing capacitors?|
"Sits on desk, no spills, drops, or any of the above, may have actually been used on battery once, otherwise plugged into the same UPS as a desktop computer, which is still fine."
The major reason for buying a laptop computer rather than a desktop computer is it's portability - it can be used on the battery alone. If you don't actually need it to be portable then you always get more bang for your buck when you buy a desktop computer. Laptops are relatively fragile in comparison to desktop computers,.
If anyone else has access to this computer, then it's possible it has been dropped or it has been exposed to liquid without you being told about that, especially if whoever it was would likely be afraid to tell you.
Nothing protects you 100% from the damage caused by a lightning strike.
Whether something is damaged can be random - e.g. one computer connected to the UPS may be damaged but not the other one.
EVERYTHING that connects to the computers must be connected to something that protects it against damage caused by power spikes and surges, etc. - ALL things that plug into the computer that plug into AC directly or via an AC to DC adapter, AND the cable that connects you to the internet, if the computer connects to the device the internet cable is connected to via a wired network cable connection. . UPSs usually DO NOT have enough places to plug everything in that plugs into the computer.
".As freely as the cooling fan spins, can't it being the problem unless yellow pulse wire not giving signal or mobo net seeing it."
It's extremely unlikely that the wire for the rpm sensor on the fan is no longer providing output - Ive never seen myself , and I've never seen that mentioned in posts on the web.
It IS possible the female connector for the fan is not getting a good connection if the laptop has been dropped.
If you have used this laptop a lot, it IS possible the fan can no longer spin at even the minimum speeed the bios expects It's very common for the deterioration of the bearings in the fan to cause that, or for the fan to stop spinning..
"Is there a key-combo that causes system to ignore prelim POST faults?"
Not that I've ever seen.
There is sometimes a setting in the bios Setup for it (the POST) to ignore certain errors, such as for a keyboard, but you would have to be able to get into the bios for long enough,
You have either a Dv7-3079nr or a Dv7-3079wm
US English model
HP Pavilion dv7-3079wm Entertainment Notebook PC
Canada English model
HP Pavilion dv7-3079nr Entertainment Notebook PC
Solve a problem
Start-up / Shutdown
Start-up / Boot-up
Manuals for HP Pavilion dv7-3079nr Entertainment Notebook PC
No Owner's or User's manual listed
HP Pavilion dv7 Entertainment PC
Maintenance and Service Guide
(Bios) Setup Utility
Pointing Devices and Keyboard
Hot Keys info.
Lights - what the leds indicate
Does your model have the fingerprint reader option ?