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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