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In the slot1 with 4GB is ok . If i put other 4GB in slot2 computer start but screen is black, display anything
Please check both slot with each of the memories individually, if everything is good both the chips and the slots, maybe the bios do not detect automanically the dual mode chanel, you will have to configure the bios.
That said you could also look and remove the battery from the CMOS motherboard and press 15 seconds powerd button, place the modules and turn on the computer.
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