I have an HP Compaq DC7100 and six months ago I upgraded to a Sony DVD RW DRU-842A. It worked perfectly till about a week ago and now it says “Device not ready” everytime I insert a cd/dvd. I also have an external dvd burner(USB connected) that reads and plays cds/dvds but I still cannot burn anything. HELP!!!
Welcome to the forum.
I’d check the cables. You may not have seated everything properly when you installed the new drive.
And you need some kind of software to burn CDs and DVDs in Windows, that feature is not built-in.
A favorite free prgram is called IMGBurn: