Intel DH77DF Technical Product Specification - Page 80
Front-panel Power LED Blink Codes, BIOS Error Messages - beep codes
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Intel Desktop Board DH77DF Technical Product Specification 4.3 Front-panel Power LED Blink Codes Whenever a recoverable error occurs during POST, the BIOS causes the board's front panel power LED to blink an error message describing the problem (see Table 49). Table 49. Front-panel Power LED Blink Codes Type Pattern F2 Setup/F10 Boot Menu None Prompt BIOS update in progress Off when the update begins, then on for 0.5 seconds, then off for 0.5 seconds. The pattern repeats until the BIOS update is complete. Video error On-off (1.0 second each) two times, then 2.5-second pause (off), entire pattern repeats (blink and pause) until the system is powered off. Memory error On-off (1.0 second each) three times, then 2.5-second pause (off), entire pattern repeats (blinks and pause) until the system is powered off. Thermal trip warning Each beep will be accompanied by the following blink pattern: .25 seconds on, .25 seconds off, .25 seconds on, .25 seconds off. This will result in a total of 16 blinks. Note When no VGA option ROM is found. 4.4 BIOS Error Messages Table 50 lists the error messages and provides a brief description of each. Table 50. BIOS Error Messages Error Message Explanation CMOS Battery Low The battery may be losing power. Replace the battery soon. CMOS Checksum Bad The CMOS checksum is incorrect. CMOS memory may have been corrupted. Run Setup to reset values. Memory Size Decreased Memory size has decreased since the last boot. If no memory was removed, then memory may be bad. No Boot Device Available System did not find a device to boot. 80