In BIOS check if the hard drive is selected has the first boot device, follow the steps below. Shut down the computer and tap F2 during the startup in BIOS page under the ‘Boot’ tab check if the hard drive is selected has the first boot device. In addition try running the hardware diagnostics to check if the hardware is working as designed; please refer to the link below. [URL] You can also run the hardware diagnostics by pressing the Fn + power.Let us know if there is any error code listed.
My 3521 started a strange behaviour, namely when I power it on it shows 2 lines saying "checking media (fail)", then a new message saying "no boot device found". It means that there is a problem with HD? or is there any setting inthe BIOS preventing the laptop to see the HD?
Inspiron 3521 not booting