Computer stuck on black screen and cursor after power up..

[MottledBreak]

I have an old Dell PC I got from my sister and was trying to fix it. When I power it up the screen stay blank only showing the mouse. I have tried win + ctrl + shift +B, ctrl + alt + del. I have tried using 2 seperate installation drivers for troubleshooting settings. I have attempted to roll back windows updates. I have tried repairing the disk through command prompt. I have also tried booting onto safe mode. Despite this nothing had changed.Any ideas?

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