Macbook Pro late 2008 17inch won't sleep or wake up

Recently I inset a SSD as a primary disk for the system and the original hard drive for storage. The system was upgraded to Marvericks 10.9.2. The computer is Macbook Pro 17 inches Late 2008 edition, A1229. 
When I close the lid, the computer won't sleep. I tried to close lid under safe mode. It works fine. However, even if all the programs are closed, the computer won't sleep when the lid is closed. I tried to change the settings for power saver and bluetooth. It doesn't help.
There are so many people experiencing the same problem. I can't believe there is still no solution. PLEASE HELP.

I have tried to imput "pmset -g" in the terminal. The output was
sleep                10 (sleep prevented by UserEventAgent, mds, backupd, backupd)

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      ID:          0x0100
      Wattage (W):          85
      Revision:          0x0000
      Family:          0x00ba
      Serial Number:          0x0063ac36
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