I have an HP with both CD & DVD/RW drives. They recognize CDs but no longer recognizes DVDs. I have Windows Media Player, ITunes, Roxio & WIN-DVD4 players. I tried updates & trouble-shooting to no avail. I'm at a lost. HELP!!!
Very possible that your DVD Drive is dead. I had a drive with the same symptoms as you are reorting. Sony diagnostics said it was a defective drive.
Had sony with the same problem the dvd worked for 8 months then just stopped but read cd until I got rid of the computer. Keep that one just for cd's if you want but you need anouther one for dvd's. No way around it