Dell XPS 720 H2C (Mid 2007) - Manual (Page 69)

Troubleshooting
69
Beep Codes
Your computer might emit a series of beeps during start-up if the monitor cannot display errors or
problems. This series of beeps, called a beep code, identifies a problem. For example, beep code 1-3-1
(one possible beep code) consists of one beep, a burst of three beeps, and then one beep. This beep code
tells you that the computer encountered a memory problem.
Reseating the memory modules may correct the following beep code errors. If the problem persists,
contact Dell (see "Contacting Dell" on page 181) for instructions on obtaining technical assistance.
If you experience any of the following beep code errors, see "Contacting Dell" on page 181 for
instructions on obtaining technical assistance.
Code Cause
1-3-1 through 2-4-4 Memory not being properly identified or used
4-3-1 Memory failure above address 0FFFFh
Code Cause
1-1-2 Microprocessor register failure
1-1-3 NVRAM read/write failure
1-1-4 ROM BIOS checksum failure
1-2-1 Programmable interval timer failure
1-2-2 DMA initialization failure
1-2-3 DMA page register read/write failure
1-3 Video Memory Test failure
1-3-1 through 2-4-4 Memory not being properly identified or used
3-1-1 Slave DMA register failure
3-1-2 Master DMA register failure
3-1-3 Master interrupt mask register failure
3-1-4 Slave interrupt mask register failure
3-2-2 Interrupt vector loading failure
3-2-4 Keyboard Controller Test failure
3-3-1 NVRAM power loss
3-3-2 Invalid NVRAM configuration
3-3-4 Video Memory Test failure
3-4-1 Screen initialization failure