Dell Inspiron 1721 (Mid 2007) - Manual (Page 99)

Troubleshooting
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3 When the DELL logo appears, press immediately.
NOTE:
Keyboard failure may result when a key on the keyboard is held down
for extended periods of time. To avoid possible keyboard failure, press and
release in even intervals until the boot device menu appears.
4 At the boot device menu, use the up- and down-arrow keys to highlight
CD/DVD/CD-RW, and then press .
NOTE:
The Quickboot feature changes the boot sequence for the current
boot only. Upon restart, the computer boots according to the boot sequence
specified in system setup.
5 Select the Boot from CD-ROM option from the menu that appears, and
then press .
6 Type 1 to start the Drivers and Utilities menu, and then press .
7 Select Run the 32 Bit Dell Diagnostics from the numbered list. If multiple
versions are listed, select the version appropriate for your computer.
8 At the Dell Diagnostics Main Menu, select the test you want to run.
NOTE:
Write down any error codes and problem descriptions exactly as they
appear and follow the instructions on the screen.
9 After all tests have completed, close the test window to return to the Dell
Diagnostics Main Menu.
10 Remove your Drivers and Utilities media, then close the Main Menu
window to exit the Dell Diagnostics and restart the computer.
Dell Diagnostics Main Menu
After the Dell Diagnostics loads and the Main Menu screen appears, click the
button for the option you want.
NOTE:
It is recommended that you select Test System to run a complete test
on your computer.
Option Function
Test Memory Run the stand-alone memory test
Test System Run System Diagnostics
Exit Exit the Diagnostics