Intel DZ77RE-75K Technical Product Specification - Page 80
Front-panel Power LED Blink Codes, BIOS Error Messages - problems
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Intel Desktop Board DZ77RE-75K 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 41). Table 41. Front-panel Power LED Blink Codes Type Pattern F2 Setup/F10 Boot Menu Prompt None 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 42 lists the error messages and provides a brief description of each. Table 42. BIOS Error Messages Error Message Explanation CMOS Battery Low CMOS Checksum Bad The battery may be losing power. Replace the battery soon. The CMOS checksum is incorrect. CMOS memory may have been corrupted. Run Setup to reset values. Memory Size Decreased No Boot Device Available Memory size has decreased since the last boot. If no memory was removed, then memory may be bad. System did not find a device to boot. 80