Dell Inspiron 17r is making a clicking noise and won't boot.

I rebooted into the Dell Diagnostics and did a full scan of the machine. All tests passed. An Internet search, and search on the Dell site didn't reveal any solution. I went on the Dell support site and found that there was a BIOS update for the machine. It was running A08 I think, and the update was A16. I downloaded and tried to install, but the install failed multiple times as the BIOS update requires a reboot of the machine to install, and it was suffering the boot/clicking problem so the BIOS update was failing. I'm stubborn and persevered, and attempted the BIOS update maybe 20 times or so, then finally once, the machine booted properly and the BIOS update installed. Problem gone after that. I truly believe Dell has a known issue with these and similar model laptops but have not admitted it. There is no "quick" repair to update the BIOS if the machine won't boot properly to install the BIOS update. You just have to be persistent and stubborn and keep trying; hopefully you can get it to boot once properly and get the update installed