New
#11
Get to the lens and clean it with a Q-Tip and a very small amount of rubbing alcohol. Clean alcohol off lens immediately too with a dry Q-Tip.
I fixed many optical drives like this. If that doesn't work, your only last hope is a firmware upgrade.
You could also fix CDs or to lesser extent, DVDs that will not play by using white toothpaste. Streak it from the center to the edge, using your thumb as sandpaper untill blemishes are gone. Clean it with water and your thumb from center to edge. Dry it. Put in computer and copy to new disc or make .iso.