No display and no beeps. Only happens sometimes?

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My friend's computer has no display and no beeps sound. Funny is she told me that it only happens sometimes. Sometimes it works, sometimes it doesn't. She tried to remove the display card and put it back but still not working. The fan is working and HDD too... Now my friend told me the computer is working again. And it only happens sometimes... What could be the problem? What's the possible problems and solution? Thank you.



Note: Sorry for not providing more information regarding the computer! It is because of humid? The relative humidity here is 80-95%.
 
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