[ubuntu] Dvd/cd drive not working

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http://ubuntuforums.org – I know this has been posted many times... but my dvd/cd drive is not working, it doesn't detect any media, any cd insert be it movie dvd, music or data isn't detected in anyway. I have read around the forums to try to solve this but the only answers I have gotten is change the AHCI mode to IDE, which I have no idea how to do....I think this can be done in the BIOS but I can't find how and also the bios does detect it. Another solution was changing kernels, but I have tried and have used both the latest and the one that came with ubuntu- nothing. I have also found that it may be s (Hardware)