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Look at the diagnostic lights to determine which state the system is in. Solid Green System is in S0 state, the normal power state of a functioning machine. The BIOS will turn the light to this state to indicate it has started fetching op-codes. Amber Second state of the light at power up. Indicates the POWER_GOOD signal is active and it is probable that the power supply is fine. Look at the diagnostic lights for further information. Blinking Green System is in a low power state, either S1 or S3. Look at the diagnostic lights to determine which state the system is in. Solid Green System is in S0 state, the normal power state of a functioning machine. The BIOS will turn the light to this state to indicate it has started fetching op-codes. Beep Codes If the monitor cannot display error messages during the POST, the computer may emit a series of beeps that identifies the problem or that can help you identify a faulty component or assembly. The following table lists the beep codes that may be generated during the POST. Most beep codes indicate a fatal error that prevents the computer from completing the boot routine until the indicated condition is corrected. 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 3-4-2 Screen retrace failure 3-4-3 Search for video ROM failure 4-2-1 No timer tick 4-2-2 Shutdown failure 4-2-3 Gate A20 failure 4-2-4 Unexpected interrupt in protected mode 4-3-1 Memory failure above address 0FFFFh 4-3-3 Timer-chip counter 2 failure 4-3-4 Time-of-day clock stopped 4-4-1 Serial or parallel port test failure 4-4-2 Failure to decompress code to shadowed memory 4-4-3 Math-coprocessor test failure 4-4-4 Cache test failure 4-4-2 Failure to decompress code to shadowed memory 4-4-3 Math-coprocessor test failure 4-4-4 Cache test failure Diagnostic Lights To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the bank panel. When the computer starts normally, the lights flash before turning off. If the computer malfunctions, the sequence of the lights help to identify the problem. NOTE: After the computer completes POST, all four lights turn off before booting to the operating system. Light Pattern A possible expansion Determine if a conflict exists by removing an expansion card (not a card failure has graphics card) and restarting the computer. occurred. If the problem persists, reinstall the card you removed, then remove a different card and restart the computer. Problem Description Suggested Resolution The computer is in a normal off condition or a possible pre-BIOS failure has occurred. The diagnostic lights are not lit after the computer successfully boots to the operating system. Plug the computer into a working electrical outlet. If the problem persists, contact Dell. A possible processor failure has occurred. Reseat the processor (see Processor information for your computer). If the problem persists, contact Dell. Memory modules are detected, but a memory failure has then reinstall one module and restart the computer. If the computer occurred. If two or more memory modules are installed, remove the modules, a time) until you have identified a faulty module or reinstalled all starts normally, continue to install additional memory modules (one at modules without error. If available, install working memory of the same type into your computer. If the problem persists, contact Dell. A possible graphics card failure has occurred. Reseat any installed graphics cards. If available, install a working graphics card into your computer. If the problem persists, contact Dell . A possible floppy drive or hard drive failure has occurred. Reseat all power and data cables. A possible USB failure has occurred. Reinstall all USB devices and check all cable connections. No memory modules are detected. If two or more memory modules are installed, remove the modules, then reinstall one module and restart the computer. If the computer starts normally, continue to install additional memory modules (one at a time) until you have identified a faulty module or reinstalled all modules without error. If available, install working memory of the same type into your computer. If the problem persists, contact Dell. Memory modules are detected, but a memory configuration or compatibility error placement exist. has occurred. Ensure that no special requirements for memory...