My laptop screen show black but on it it shows window 7 proffesion

I was installing theme on my laptop after it get download I start I stalling on my laptop but while it was applying to laptop I suddenly shut down my laptop and after I open it its show the black screen and don't show desktop icons and task bar it show only cursor

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Sounds like you have an issue that can be solved going to the recovery environment. From what I can see you have a dell laptop so I will refer you to their site

https://www.dell.com/support/kbdoc/en-us...

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