DVDs Are Not Recognized

I updated my PowerMac (2.0GHz G5, 3GB RAM, LaCie dual-layer DVD burner) to 10.5.6. I tried burning a DVD (copied from a VHS tape and converted to a VIDEO_TS folder, and burned via Toast), and everything was fine, but it crashed halfway through burning the DVD. That's happened before (ever since switchig to Leopard), but not recently. So, I put in another DVD+R and the same thing happened. So, I restarted the machine, and now it won't even recognize that there's a disk in the drive.
So, I powered down and restarted the machine and the same thing happens. I also tried DVD+R DL, and they're not recognized, either. I haven't tried putting in a DVD movie yet, though.
Any ideas?
TIA

Thanks for the replies.
I tried to mount blank DVD-R and DVD+R discs with sudo mount /dev/sr0 /mnt/CD.
I keep getting the answer: mount: no medium found on /dev/sr0.
On some discs it returns with:
mount: wrong fs type, bad option, bad superblock on /dev/sr0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
but I have not been able to find a pattern for when it will do this.
I ran smartctl -T permissive -i /dev/sr0 with a disc in the drive and got this response:
=== START OF INFORMATION SECTION ===
Vendor: MATSHITA
Product: DVD-RAM UJ-832
Revision: 1.00
Device type: CD/DVD
Local Time is: Fri Jan 31 06:18:51 2014
device Test Unit Ready [medium or hardware error (serious)]
SMART support is: Available - device has SMART capability.
SMART support is: Disabled
Temperature Warning: Disabled or Not Supported
My first thought is that the two thinkwiki pages that I posted have links to firmware updates far past 1.00. However, I still can't tell which drive I have.

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