Acer aspire 5741 starts but black screen

Sep 8, 2013
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I have a acer aspire 5741 which when press the power button, the hard drive starts and the power led turns on but there is no screen input. There is a HDD LED which should light up but does not. I also plug a moniter in the hdmi and vga port but does not work. I tred starting it up by plugging in the AC adaptor but does not work