My Acer Aspire one monitor is not working

Hello,

My Acer Aspire one, lop top is not working.. it's cpu is working properly. I could confirmed since out put vga out put is working properly in other display. it's confirm that display power is ok since it's backlights are working. only the case is signal not rcving. pls guide if anyone is having experiences with this.

tks,

Samantha