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Laptop not coming on after motherboard change


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Hello. I just installed a used motherboard to my sager p157sm.  When I try to power on, the light turns green, turbo light comes on, it stays that way for 29 to 39 seconds, turns off then automatically turns itself on again following same cycle all around. I ve reseated fans and gpu and also tried booting without gpu which also didn t work out. I tried booting with a single ram and changing ram slots and also tried a CMOS reset and nothing. Any help will be appreciated.  Btw, board was confirmed working before this escapade. 

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