Question My Dell laptop Latitude E5420 comes up and goes off in two seconds with a hiss from the HDD.pls what do I do ?

Jun 4, 2020
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My Dell latitude E5420 was working, but I wanted to upgrade from Windows 7 to Windows 10 Os. So I attempted a restart due to the sluggishness I noticed since many applications were opened. But it became slower. So I decided to forcefully shut down and when I powered on again I noticed it won't come up. The fan rolls and the HDD makes a small hissing sound and off it goes within three seconds. Pls what do I do?
 
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