How do I know if I need to replace my DVD drive in my laptop?

How do I know if I need to replace my DVD drive in my laptop or if its something else wrong with my computer?

In the past, my DVD drive would disappear from My Computer and I couldn't even open it up with the button. No problem. I'd reboot and most of the time it would be there. If a reboot didn't work, I'd try to see if I could watch DVD's by circumnavigating the typical Windows startup and go into a quick start up media program by pressing not the on/off power button but the quick start DVD/media program.

For at least a couple of months, I haven't had a working DVD drive. My Computer doesn't recognize it as a drive. It doesn't recognize DVDs or audio discs. My quick start DVD/media program doesn't recognize that I have a DVD drive either.

Also, everytime I start up my iTunes I also get this message:

I already tried to reinstall iTunes but that was a no go.
Because I think it maybe a hardware issue given it doesn't open when I press the button, should I just buy a new DVD drive and replace it. Or is there a way to test out things like the motherboard connection and the DVD section of the registry, etc?

My device manager says I have problems with a couple of items. Don't know exactly what they are and would like to see if they are relevant to my DVD
problem.

Oh! And I can't seem to find my DVD drive on my Device Manager.