eng.omnia
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inspiron3521

i try to install windows 8 but there are problem on windows so it not installed correctly and the past windows deleted so try to install Ubuntu 12.04  and work correctly about month but try to install windows again but this time the windows is good and installed correctly but when remove the usb the laptop not work and  gave me black screen i want to know what i the problem and how i fix it . thank you

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