My dell laptop inspiron 15R 5521 shows black screen . When i was operating it there is a option like first screen,second screen by mistakenly i click second screen after that it shows black screen . I think laptop is running ok but i can't back to first screen .please tell me how i m back to first Screen.
Can you explain, please, what do you mean by first screen and second screen? Have you restarted your laptop in Safe mode or something? What implied entering in Safe mode if that's the situation?
I would appreciate if you tell me more about your issue.
If you can hear the hard drive and the fan spinning, then I would recommend you to enter the BIOS setting and check if the hard drive is set at the first place in the boot priority. You can do that by restarting the lappy and pressing the respective F key.