Acer aspire g5290, can enter bios,no display

Hello,
i have a problem with my acer g5290. When it powered the things come as usual,we can hear the sound,fan is running,but it keeps black screen only. luckily i can enter my password correctly without looking the display and it work! but still, no display at all. Can anyone tell me how to settle this?
Your help is gratefully appreciated.