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This is a hardware issue, you need to take the computer to a Customer services centre to replace the cracked screen or you can buy it from a local market and replace through customer services centre. To retrieve all the data from your hard disk, you need to take it to a hardware expert, who, by using a special machine, will retrieve all your data on the hard disk.
if your computer still under warranty please contact acer at : http://us.acer.com/ac/en/US/content/service-contact
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