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Introduction
If your screen is cracked or non-functional you have two options:
* You can replace the entire laptop lid assembly including the LCD panel, web cam, microphone, WiFi aerials, case and hinges. You may wish to do this if the plastic case is damaged. See [https://www.ifixit.com/Guide/Acer+Aspire+5742+Screen+Replacement/116918]
* If only the LCD panel needs replacing then you can do just this as described in this guide. There is much less preliminary disassembly to do, but bear in mind that the LCD is delicate and you need to take care not to crack your new one.
If the problem is simply that the screen is blank though undamaged as far as you can see, there is a small chance that the video cable needs reseating either at the motherboard or at its connection behind the LCD panel.
The photos in this guide show the lid assembly separated from the laptop body, but this is not necessary.