RAM addition boot problem

Mar 10, 2018
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After RAM (DDR2 800MHZ ) upgrade , PC won't boot. Purchased 2* 2gb DDR2 RAMS from Kingston, each one works singly in both slots. Eg31m v.1.0 Mobo. Cpu 4600, Core 2 duo? After getting Pc on for a while, addition of RAM works temporarily. once PC is shut of from mains for 15 min, again, it does not give output, only fan moves, and clicking sounds come from Mobo.than after removing one of the installed RAM, SYSTEMS BOOTS AGAIN