Hello, I have been having this problem for a while now. The issue is this,several months ago I was running a msi k7n2 board with an athlon 3200 processor. Ok I had no problems playing dvd's, One day I put a dvd in the machine and it just stopped working. The dvd drive played cd's and burned cd's and even was recognized by the system but kept just playing the warnigs about copywrite infringement and the pg rating and would automaticaly stop after this. Since then I have replaced my mainboard and the processor as well as the dvd player. I thought I had a short in the system for other reasons. Ok so now all my other problems are solved but I'm getting the same error from my floppy drive and my dvd player. Here is the output when I try to start from the command prompt. a free video player v0.99.4.
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gnome-screensaver-Message: Failed to connect to the D-BUS daemon: No reply within specified time
libdvdread: Encrypted DVD support unavailable.
libdvdread: Can't allocate memory for file read!

Here is the message from dmesg----->[17185259.088000] ide: failed opcode was: unknown
[17185259.088000] end_request: I/O error, dev hdb, sector 363692
[17185259.268000] hdb: command error: status=0x51 { DriveReady SeekComplete Erro r }
[17185259.268000] hdb: command error: error=0x54 { AbortedCommand LastFailedSens e=0x05 }
[17185259.268000] ide: failed opcode was: unknown
[17185259.268000] end_request: I/O error, dev hdb, sector 363696
[17185259.384000] hdb: command error: status=0x51 { DriveReady SeekComplete Erro r }
[17185259.384000] hdb: command error: error=0x54 { AbortedCommand LastFailedSens e=0x05 }
[17185259.384000] ide: failed opcode was: unknown
[17185259.384000] end_request: I/O error, dev hdb, sector 363700
[17185259.568000] hdb: command error: status=0x51 { DriveReady SeekComplete Erro r }
[17185259.568000] hdb: command error: error=0x54 { AbortedCommand LastFailedSens e=0x05 }
[17185259.568000] ide: failed opcode was: unknown
[17185259.568000] end_request: I/O error, dev hdb, sector 363704
[17185259.680000] hdb: command error: status=0x51 { DriveReady SeekComplete Erro r }

So, do you have libdvdcss installed?

Yes I do

Hey everyone. Thanks for the help. I installed libdvdcss and it works just as before. I just wish I did not waste the money in buying a new player. Now I can watch Jimi Hendrix Live in concert and Revenge of the Sith. Thanks again. You guys are the best.