iMac G5 LED 4 problem


hey guys today got new power supply put in old imac g5. , when put , turned baby on got chime , led 1 , 2 turn on along fan next cd drive.. not sure if other fan turned on since can see it.. anyways of happens within 5 seconds , red led light comes on , shuts down.. have clue what's causing ?

before reassembled did noticed might need reapply new thermal paste.. problem? or maybe pramm batttery? never changed either
 



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