Dell 720H2C When to Use Dell Diagnostics, Starting Dell Diagnostics From Your Hard Drive

Failure	communicate with the floppy	drive is installed correctly in the computer
	drive or hard drive	(see Drives) and defined correctly in the
HDD Controller	controller.	system setup program (see System Setup).
		Check the interface cable at both ends.
Failure
INTR1 Error	An interrupt channel on the	The keyboard or system board may need to
	system board failed to	be replaced.
INTR2 Error	POST.
Invalid Boot	The operating system	Enter the system setup program (see
Diskette	cannot be located on drive A	System Setup) and confirm that drive A or
	or drive C.	drive C is properly identified.
Keyboard Error	The BIOS has detected a	Ensure that nothing is resting on the
	stuck key.	keyboard; if a key appears to be stuck,
		carefully pry it up. If the problem persists,
		you may need to replace the keyboard.
KB/Interface	An error occurred with the	Ensure that nothing is resting on the
Error	keyboard connector.	keyboard; if a key appears to be stuck,
		carefully pry it up. If the problem persists,
		you may need to replace the keyboard.
No ROM Basic	The operating system	Enter the system setup program (see
	cannot be located on drive A	Entering System Setup) and confirm that
	or drive C.	drive A or drive C is properly identified.

Dell Diagnostics

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

When to Use Dell Diagnostics

If you experience a problem with your computer, perform the checks in Solving Problems and run Dell Diagnostics before you contact Dell for technical assistance.

NOTE: Dell Diagnostics only operate on Dell computers.

Run Dell Diagnostics from your hard drive or from the Drivers and Utilities media.

Starting Dell Diagnostics From Your Hard Drive

1.Turn on (or restart) your computer.

2.When the DELL logo appears, press <F12> immediately.

NOTE: Keyboard failure may result when a key is held down for extended periods of time. To avoid possible keyboard failure, press and release <F12> in even intervals to open the Boot Device Menu.

NOTE: If at any time a message appears stating that no diagnostics utility partition has been found, run Dell Diagnostics from your Drivers and Utilities media (see Starting Dell Diagnostics From the Drivers and Utilities Media).

If you wait too long and the operating system logo appears, continue to wait until you see the Microsoft® Windows® desktop, then shut down your computer and try again.

3.At the Boot Device Menu, use the up- and down-arrow keys or press the appropriate number on the keyboard to highlight Boot to Utility Partition, and then press <Enter>.

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.

4.At the Dell Diagnostics Main Menu, left-click with the mouse, or press <Tab> and then <Enter>, to select the test you want to run (see Dell Diagnostics Main Menu).

NOTE: Write down any error codes and problem descriptions exactly as they appear and follow the instructions on the screen.

5.After all tests have completed, close the test window to return to the Dell Diagnostics Main Menu.

6.Close the Main Menu window to exit Dell Diagnostics and restart the computer.

Starting Dell Diagnostics From the Drivers and Utilities Media