First hit F2 and enter setup. From here check and see if your BIOS reconizes your hard drive. If not shut down the computer. Open the bay where the hard drive and make sure none of the connections are loose. Then replace the cover and boot again. Let us know what you find.
On a Dell there is typically a hard drive diagnostic program that you can access from the menu you get after hitting the F12 key (I think it's F12) when prompted after turning on the machine. You could try that. If that diagnostic says it is not seeing a hard drive, then the drive is not being seen by the BIOS and is likely dead. If it does see it, it will run a diagnostic to determine if the drive is good or not.
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