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Gateway DX 4840 trying to upgrade RAM 8GB to 16 GB

Gateway DX 4840 trying to upgrade RAM 8GB to 16 GB

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Gateway DX 4840 trying to upgrade RAM 8GB to 16 GB

Gateway DX 4840

Intel i3 540 @ 3.07GHz

BIOS version P01-A0 03/19/2010

Chipset Intel H57

Memory originally 8 GB (4 x 2GB) dual-channel 1333 MHz DDR3 (double sided) CL9

Specs say "Upgradeable to 16GB using four DIMM modules"

 

Tried to upgrade to Kingston ValueRAM 16 GB (4 x 4 GB) 1333 MHz DDR3 CL9 DIMM SR x8 STD

(previously tried 4 Patriot sticks at 1600 MHz - wouldn't boot in any combination)

 

Computer beeps once but won't boot.

 

Tried new RAM in all 4 slots - won't boot.

Tried original 2 GB in first two slots with new 4 GB in last two slots - won't boot.

Replaced original 4 x 2GB ram (all four slots) - boots just fine.

 

Any idea what the problem is or what I can do?

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