DVD-R Boot Problems

[PowerLoaf2001]

Greetings to everyone!

I've been checking out this forum for a couple of weeks now; i just want to begin by saying everyone is very friendly and willing to help! I'm impressed with everyone's attitude. Anyhow, here's what's happening with me:

I've got a v5 PS2 with a No-Solder Modchip (here's a pic: http://www.modchipshop.com/images/fig110.jpg ).

I use a GameShark 2 v 2.11 to boot. I can boot CD-R backups, but I haven't been successful booting any DVD-R backups. Concerning the burning, I use Nero 5.5.8.0, and I've tried Princo and Memorex media. Boot Methods- I've tried everything listed at http://www.psxcopyworld.co.uk/ as well has various boot methods I've seen in posts around here (using GTA 3/Devil May Cry for the large TOC).

If anyone sees that I have missed something or has a suggestion that would be great.

PowerLoaf2001