Something I never knew until today.
DVD Players/Recorders can "BRICK"
I downloaded an official firmware for my DVD player/recorder (from the manufacturers site) earlier and followed all the steps (even for making the CD image and burning), then I placed the CD in the disc tray and it went through the process of upgrading the firmware.
The screen showed that it was upgrading and then showed it had successfully finished, but when I inserted a DVD disc it showed an error message saying "Put Cd In" and I though to myself that it meant the upgrade firmware CD I had created. But it wasn't, and my DVD player/recorder then refused to show any output whatsoever so I came to the conclusion it had bricked...
...But to my suprise when I Googled it, it had also happened to other people. I then went to think why the company didn't fix the firmware (it's just over a year old), but thankfully due to the manufacturers neglect a group of hackers had made a program to hack and customize the official firmwares within seconds which then with my new firmware I re-followed the steps of creating the disc image and burning. And to my total amazement, the firmware I had customized with the software unbricked my DVD player/recorder.
Firmwares are everywhere thesedays, and hackers who do their own things to these firmwares. Those hackers saved me from having to send my DVD player/recorder (which is past it's warranty) away to be repaired, it's cool how hackers help us more than the manufacturers on lots of things :)