Samsung Combo not detecting DVDs

[nitroshift]

For cleaning the lens, do i need to get a special CD or something? I think i have heard of Lens Cleaner disks...Is there any other option?

Lens Cleaner cd's are ok... What I do though is a bit more tricky for begginers: I dismantle the drive and clean the lens using a cotton bud and technical spirit. I'd not recommend you to do that though... Try the Lens Cleaner cd.