Hi  DLOVE123

Thanks for contacting the community. 

1.  Restart the computer.
2. As the computer boots, press when the Dell Splash Screen appears.
3. Look for fixed HDD on the main screen.
4. In case hard drive is detecting in BIOS, try to load system BIOS to default by Pressing F9 and press F10 to save and exit.
5. If it’s not detected in BIOS then try to reset the hard drive. Please click on the link mentioned below to view the steps for assembling and disassembling that might help you: http://bit.ly/YvgnFe. 

Please reply if you have any further questions.

Thanks & Regards
Prateek K
#iworkfordell

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