Compressor Problems

I've recently been coming across some problems with my compressions.

First of all it was a couple days ago when I tried to compress a 3 min video (1080i - 29.97i - 1440x1080) it toke around an hour to finally finish but when it was done I got a "Failed" underneath the progress bar, I didn't know why so I just burned the video straight from FCPX to a DvD.

The next day I tried to compress a 45 min video and got the same problem, (1080i - 29.97i - 1440x1080) I used the default Disc Burning DolbyDP and MPEG 2 options but it still failed, I also sent the project straight from FCPX to compressor, I didn't export it from FCPX than send to Compressor.

Today however I tried compressing a 30 second video to test after I deleted the cache by going to Finder > Go > Go to Folder > /var/spool/qmaster/ > and then I sent the file there to the trash and restarted my computer. My first try resulted in the timer to keep increasing and never decrease, and second try the timer said at -:--:-- remaining, it never moved.

If you can help me out at all it would be much appreciated, thank you in advance to anyone who takes the time to help me out, this is the first time I've come across these problems.

Get this book, it will help out a lot.
www.amazon.com/Apple-Pro-Training-Series...eries+compressor+3.5

All the information pertains to both versions 3.5 and the current version 4.