HP All In one (Boots to Black screen)

Hello,

I had this same problem with my other computer and never found out what died.

Yesterday, I shut down the computer normally (construction people doing work in the front yard and they killed our last machine clicking the hydro on/off),so last night after they left I hit the power button and walked away.

Thinking it was booting normal....

Today nothing works? you can hear the fans running and the power light is blue and the HDD clicks 1-2 times and the machine just hmms.

I followed this but nothing works
https://support.hp.com/ca-en/document/c03561545

Can I force boot up with a USB stick or something? also if I supply a new HDD to the computer shop, as I don't want the original one wiped to save the data would that work.

Never did backups and the computer is from 2011, but I have a dock here and would like to see what data I can get.

I thought I would ask here for help.
Thank you