Lg gsa h55n not reading cd and dvd and not burning

can somebody pls help me… i have a lg gsa h55n dvd burner… my problem is its not reading cds and dvds and if i want to burn there is an error code 03 0c 80… i googled this problem and have seen many forums but nothing happens.
what i did:

  1. replaced the ide 40 to 80 cable.
  2. replaced power supply unit to 350w.
  3. cleaned the lens directly with cotton tip and i also bought dvd lens cleaner to be sure…
  4. formatted the computer…
  5. uninstalled the driver. and installed it again.
  6. i have the latest firmware.

but nothing happened…