Aspire 5535/5235 series power problem

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Hello,
I was using my lab top yesterday and it was working just fine but today when I press the power button first fan starts to work and green light turns on but CPU light is still off and no display at all, then after 10 sec fan turns off and only the green light of lab top is on.
if I leave it like this fan starts to work steady after 10-15 min but no display.
Please advise me
Many thanks in advance.