Computer slow

[Jjjefferies]

My computer will turn on and works but ever since I've moved it has been very slow. I believe it is the hard drive, but when I replace it the computer won't work!
I am not sure what to do at this point.

 

[Cycloid Torus]

Replace HDD which works. Make backups of data files. Check HDD integrity with chkdsk. Defrag,

 

[Jjjefferies]

Replace HDD which works. Make backups of data files. Check HDD integrity with chkdsk. Defrag,

I have already replaced my HDD with different types but none of the ones I replace them with turn the PC on

 

[Cycloid Torus]

Review these articles...

https://www.pcworld.com/article/131231/how-to-install-a-new-hard-drive-in-your-desktop-pc.html

https://www.pcworld.com/article/248980/how-to-partition-and-format-your-hard-drive-in-windows.html

Can you identify any missed steps?