Boot disk not operating

[Don Shutts]

I need a system disk for a HP PAVILION 540n

 

[soundguruman]

The actual HP system disk, you can buy it from HP, on their website. If what you needed was the drivers, you can download those off the HP website.
If you want to just check system, you can use something like Hiram's boot disk, and you can download that from several places and put it on your own disk.
But what more specifically are you trying to fix?