Faulty ram module can also cause cycling. Remove the side panel and see how many modules are installed 1-4 on most. Make sure the unit is off and if you have more than 1 ram stick installed, remove all of them but one, the one furthest away from the cpu heatsink...leave that one in. Try booting now. If that does not work. Remove the single stick of ram and install another ram stick into another ram module and try booting again. If it is still cycling it is not likely the ram.
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