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Trying to upgrade an older intel system with DZ-77SL-50K & i5-3470K before installing win7. Power supply, CD-ROM, SSD are assumed good.
From 1st power on, fans startup, power on LED lights and after 2 seconds a red LED near the cpu fan header flashes and everything shuts down. A second later it trys to startup and 2 seconds later the red LED flashes, repeating the cycle until pressing and holding the front panel power button for a hard power off. Green standby LED remains on and power fault LED remains off throughout the cycle.