Black screen

I have an emahine t5048 running xp. when i push the power button the the yellow light below the power button comes on solid.The light around the power button does not come on.The psu and the the fan attached to the large heat sinc are running. The cd tray will not open. Im thinking about replacing the psu.If this is not a simple fix id rather replace the computer than spend a lot of money trying to fix it.I have 2 questions is there a test i can do to identify the problem? Can I recover the files on the hard hard drive without 1st fixing the problem.Any advice would be appreciated. Thanks----Chuck
 
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