Dell optiplex 755 wont boot

I have a Dell Optiplex 755 - have had it for about 3 years and it isn't booting at all. It is getting power ( power light is green) ~ but it won't even give me a message as to why it isn't booting. Suggestions?
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More about dell optiplex wont boot
  1. Do you have a USB or external hard disk plugged into the front USB port?

    Just remove it and start the computer.
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