1. Try the usual CD/DVD lens cleaner.
2. Test the drive by booting any bootable DVD from it. If that fails, pop in a new DVDRW drive.
At 20 bucks new from Newegg.com NO ONE FIXES DVDRW DRIVES!
I have an HP PAVILION 510c XP home with a hp 840 dvd writer. It was working perfectly and all of a sudden it won't read ANY dvd's. It keeps saying "NO DISC IN DRIVE". it still reads music cd's and cd roms. how can i fix this problem?