Pc dead. How to get the windows product serial number? Want to use it on new laptop

[Larsoppirallkat]

Svart skjerm og piping ved oppstart. Skjermkortet har tatt kveld. Sku hatt serial key te windows 8 så jeg kan bruke det på ny laptop. Blir vel hp support som kan hjelpe meg

[Lil_Boy_Blue]

Hi

Try Google translate if necessary.

Black screen and piping at startup. The video card has taken evening. You should have serial key to windows 8 so I can use it on a new laptop. Become a hp support that can help me

Beep and Blink error codes   https://support.hp.com/us-en/document/bph07107

Black screen    https://support.hp.com/us-en/document/c02693833

First please try this...
https://support.hp.com/us-en/document/c01684768/

This works for most HP Laptops (and some Desktops)...

To perform a power reset on a laptop with a sealed or non-removable battery:
Turn off the computer.
Remove the computer from any port replicator or docking station.
Disconnect all external connected peripheral devices such as USB storage devices, external displays, and printers.
Unplug the AC adapter from the computer.
For most laptops, press and hold the Power button for 15 seconds to reset.

To perform a power reset on a laptop with a sealed or non-removable battery:
Turn off the computer.
Remove the computer from any port replicator or docking station.
Disconnect all external connected peripheral devices such as USB storage devices, external displays, and printers.
Unplug the AC adapter from the computer.
For most laptops, press and hold the Power button for 15 seconds to reset.

Usually keyfinder is a good solution.

If in doubt please ask.

[Larsoppirallkat]

The harddisk is out of the laptop. Laptop destroyed. Have ordered an adapter "usb to sata harddisk" to retrieve all of the data on harddisk. 

[Lil_Boy_Blue]

OH!

Sorry I can't help.

Then any embedded key is also lost / destroyed.

This is somewhat useless info

W10 Home Key   aaaaa-BBBBB-11111-22222-a2zed

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SoftwareProtectionPlatform
BackupProductKeyDefault     aaaaa-BBBBB-11111-22222-a2zed

##########
ShowKeyPlus - Windows Product Key Information
Product  Name:    Windows 10 Home
Product ID:    XXXXX-0000-00000-AAOEM
Installed Key:    aaaaa-BBBBB-11111-22222-a2zed
OEM Key:    AAAAA-BBBBB-CCCCC-DDDDD-EEEEE
OEM Edition:    Win 10 RTM Core OEM:DM

[WAWood]

@Larsoppirallkat

To answer your original question in the thread title -- basically, you can't if the PC is dead.

With Win8 and newer, instead of being stored on the hard drive, the Windows product key is encoded into the UEFI firmware of the motherboard. 

There are utilities you can download and run to retrieve the product key, but they have to be run on the original PC in order to access the motherboard firmware.

So, having the hard drive accessible to another PC will do you no good.

Additionally, with OEM PCs, the Windows product key is tied to the PC, not to the owner.  So, even if you COULD retrieve it, you could not use it on a different PC as that is a licensing violation.