DVD Burner broken?

  Model Name:	iMac
  Model Identifier:	iMac4,1
  Processor Name:	Intel Core Duo
  Processor Speed:	1.83 GHz
  Number Of Processors:	1
  Total Number Of Cores:	2
  L2 Cache (per processor):	2 MB
  Memory:	2 GB
  Bus Speed:	667 MHz
  Boot ROM Version:	IM41.0055.B08
  SMC Version:	1.1f5
  Serial Number:	CK61105TU2R

  Firmware Revision:	FB2U
  Interconnect:	ATAPI
  Burn Support:	Yes (Apple Shipped/Supported)
  Cache:	2048 KB
  Reads DVD:	Yes
  CD-Write:	-R, -RW
  DVD-Write:	-R, -RW, +R, +RW, +R DL
  Burn Underrun Protection CD:	Yes
  Burn Underrun Protection DVD:	Yes
  Write Strategies:	CD-TAO, CD-SAO, DVD-DAO
  Media:
  Media Type:	CD-R
  Blank:	Yes
  Erasable:	No
  Overwritable:	Yes
  Appendable:	Yes