Why my projector is turning on then off straight away?

I opened up only the cover of the projector to clean and then closed it. In between I removed only the main board cable and fixed it back. But now the projector is not turning on. It turns on and the light blinks and then turns off straight away. Is it the main board cable needed to be changed or any other idea.

thanks.

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@laialopez which lights blink? Power indicator light above the power button? Blinks all the time are blinks in a pattern?

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Actually when I switch the power plug on all the lights turn on for 1 second and then the projector and lights turns off immediately.

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