Burning dvd's

Try cleaning it using a CD/DVD lens cleaner that uses tiny brushes.

Then perform an SMU reset:

Resetting the SMU on a G5 iMac:

http://support.apple.com/kb/HT1767

and on resetting the PMU on a Power Mac G5, G4 and G3 :

http://support.apple.com/kb/HT1939?viewlocale=en_US

http://support.apple.com/kb/HT1436

Resetting the SMC (System Management Controller) on Intel-based Macs:

http://support.apple.com/kb/ht3964

Resetting your Mac's PRAM and NVRAM:

http://support.apple.com/kb/ht1379

If none of that improved matters consider the Pioneer dead. 😟

Klaus1 wrote:

If none of that improved matters consider the Pioneer dead. 😟

Hes right. But hey, these drives are EASILY replaceable and you can get an even better burner with Lightscribe and Dual Layer burning support AND DVD-RAM burning support as well for chump change at OWC.

http://eshop.macsales.com/item/LG/GH22LP21LS/