USB ports, dvd drive, sd slot not mounting

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http://askubuntu.com – Ok so the so the other day everything was working fine. I could put in a flash drive and move files back and forth. I put in a cd and ubuntu prompted me what to do. After turning on my computer and popping my flash drive in nothing happened, same with the cd. What can I do to fix this problem. Also using ubuntu 12.04 (HowTos)