Blank screen

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Hello,
my name is Alina. last week i have a issue with my DELL laptop Model 3537 i3 Graphic card was failed technician changed tht with some intel chip. then for 3-4 days it was working fine.. i went to a website to download c cleaner professional.. and all of sudden chrome was closed even my google was not responding i lost my google page few advertisement pop ups in china language started even my windows defender turned off automatically. all the application hunged, then i turned off my laptop from power button directly when i started back Dell logo appears and few dots was spinning it took 5 mins then screen was blank then login screen appears after login it was just saying welcome. then blank screen...kindly help me with this issue.