How do you know it starts if nothing is displayed? Do you hear the windows startup sounds?
If you mean you hear fans and drives spinning up and see LEDs lighting up, well that doesn't mean it's starting up. It only means the fan and drive motors are working and the LEDs are receiving voltage.
My pc' s hard disk failed and I remove the hard drive. Then I used ubantoo to star my pc and I can use some programs and Internet explorer. I did not use my pc for some time and last week when I turned it on , I can't see the display but the fan an LED star as you said.
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