I have been having problems with booting DVD-Rs on my PS2 a 30001 R V5 NTSC (Magic 2R with Clip) burned using my Panasonic LF-D311 DVD R/RAM. I could only get them to work if I:

1. ejected the trey
2. inserted the DVDR
3. tapped reset to close the trey
4. tapped reset again when the trey was halfway closed.

2 weeks ago I tried DVD+R media and to my suprise they booted
just like the originals first try every time.

I now will be selling my Panasonic LF-D311 DVD R/RAM and buying the Sony DRU500A.

If you are having problems with DVD-R try DVD+R