Asus — hanging issue

Address: Lucknow, Uttar Pradesh

model no AU X553M N3540/5AG5/2G serial no EBN0CV[protected] above mention model no of ASUS laptop purchased around on 2nd may 2015 has an issue of hanging just after bootup then i submitted on 18.5.15 at ur service center in lucknow regarding hanging issue.they said hard disk n mother board will b replaced n it will b delieverd after fortnite so after fortnite on 1.6.15 i collected my laptop then on reaching to my office i startup my laptop but same problem of hanging persist but i was astonished to see windows 7 installed instead of windows 8 but i think no hard or mother board has been changed yet kindly resolve this issue of hanging in my laptop as soon as possible