Fedora Boot Hangs

Hi, I recently set up a machine as a PVR using Fedora Core 4 - kept up to date with yum [mythtv@pvr ~]$ uname -a Linux pvr.rajserv.lan 2.6.14-1.1653_FC4 #1 Tue Dec 13 21:32:09 EST 2005 i686 i686 i386 GNU/Linux Hardware: ASUS P5RD1-VM1 with a Celeron 2.66G processor (has an Azalia/Intel HDA sound card integrated) Pioneer 16xDVDRW Western Digital 160G drive (sata I) 512 M of RAM Hauppauge PVR 350 Video Card Everything works great except for two minor yet annoying issues. Problem 1: When I try to reboot the machine with a commercial DVD (Office Space for example) in the drive, the boot process hangs with the following message: Reading all physical volumes. This may take a while... /dev/hda: read failed after 0 of 2048 at 573177856: Input/output error After taking the DVD out of the drive, everything works great (after a reboot). The DVD player works great as well and I am able to use it after boot without any issues. The funny thing is that it doesn't happen when I have DVD-R media with home made movie in the drive. Problem 2: In all cases, when I perform a cold boot - when initializing audio, the boot process hangs. Pressing CTRL-ALT-DEL or the reset button seems to work and the next boot seems to work. This happens even after I disable the Azalia controller in the BIOS. I don't think these problems are related - but I posted them together incase they are since the both happen during boot. Any help would is appreciated, Thank You, Rajeev.