checked the dell web site and found this info. depending on the mdel it may have the diagnostics built into the BIOS
Running the Hard Drive Diagnostics from the BIOS
For Latitude portable systems and Inspiron 7500, 5000, 5000e, 3700, 3800, 4000 and 8000 series systems, the hard drive diagnostic test is built into many versions of the BIOS. To ensure that your system has the hard drive test, you should upgrade to the latest version of the BIOS available from support.dell.com.
NOTE: All Inspiron 4000 and 8000 BIOS versions include this hard drive diagnostic tool in the BIOS; therefore, neither of these systems require a BIOS upgrade.
Please refer to Dell Knowledge Base Article: FA1033387 Title "How can I get the latest basic input-output system (BIOS) file and instructions on flashing, or updating the BIOS?" for instructions.
To Start the Diagnostics
To start the BIOS hard drive diagnostic, perform the following steps:
At the Dell BIOS splash screen, press the ++ keys at the same time.
The computer beeps once to acknowledge that the hard drive diagnostics have been initiated and the following message appears:
IDE Diagnostics running, please wait
Primary
Drive 0: (Drive Model) -
The test may take up to three minutes to run the diagnostics (the time is dependent upon the size and speed of the drive).
When the diagnostics are complete, one of the following messages appear:
IDE Diagnostics running, please wait
Primary
Drive 0: (Drive Model) - Pass
Drive 1: No IDE Device
Secondary
Drive 0: (CD-ROM Model) - Diagnostics not supported
Drive 1: No IDE Device
Test complete, Press to reboot
Press the key and restart the computer.
NOTE: A Primary Drive 0: failure message may also appear. Proceed to the If the Hard Drive Diagnostics Reports Failures section. An error code does not indicate a definite drive failure.
If the Hard Drive Diagnostics Reports Failures
If the Primary Drive 0: indicates a failure, perform the following steps:
Reseat the drive and confirm that the hard drive is recognized in the BIOS settings. For information on how to enter your system BIOS, refer to Dell Knowledge Base Article: TT1012573.
If the diagnostics continue to fail, you can communicate by e-mail with a Dell Technical Support Rpresentative for additional troubleshooting assistance. Navigate to the following link and select the option that best describes your problem:
http://support.dell.com/us/en/emaildell/.
Reseating the Hard Drive
For information on reseating the hard driver refer to the removing and replacing parts information at Dell's Web site. To do so, perform the following steps:
Browse to
http://support.dell.com/us/en/home.asp.
Enter your Service Tag number or choose your system type.
Click GO.
Under the Fix-It heading, click Your System Documentation.
Click Using the Computer. (The wording of the selection may vary.)
Click Storage Devices. (Again, the wording may vary.)
Follow the instructions on how to remove the hard drive, and then reverse the process to reseat the drive.