Hi riddhesh002,

I would suggest that you run the diagnostics on the computer by following the steps mentioned below and check if there is any issue with the hardware on your system.

1. Turn on or restart the computer.
2. Immediately at the Dell logo screen, starting tapping the key once a second until the One Time Boot menu appears (if the computer boots to Windows turn the computer off and try again).
3. At the One Time Boot menu, press the arrow key to highlight Diagnostics, PSA+ or Enter ePSA, then press to begin the hardware Diagnostics.
4. Write down any error codes listed. Reply to us with the error codes.

Error code detected 2000-0145

Hi riddhesh002,

The error is related to hard drive. I would advise you to refer to Pg. no.23 – 25 using the first link to remove and reseat the hard drive on the system and then use the second link to download and flash the BIOS on the computer. Rerun the hardware diagnostics.

Dell Inspiron 5521 manual: http://bit.ly/UB7A3C

Dell Inspiron 5521 BIOS: http://dell.to/1b3UUZ5

Please let me know if this helps.