Hi, I recently upgraded the graphics and OS for the older system below: Original PC Specs to be Upgraded: Intel Core i7 920 Nehalem 2.66GHz LGA 1366 EVGA 132-BL-E758-TR LGA 1366 Intel X58 ATX Intel Motherboard 6 GB of GSKill memory EVGA 896-P3-1255-AR GeForce GTX 260 Core 216 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card x 2 in SLI 128 gb Intel SSD Western Digital Caviar SE16 WD6400AAKS 640GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive COOLER MASTER Centurion 590 RC-590-KKN1-GP Black SECC / ABS ATX Mid Tower Computer Case - Retail CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Vista 64 Acer X223Wbd Black 22" 5ms Widescreen LCD Monitor I updated the graphics to an EVGA Nvidia 1060, 6gb and the OS to Windows 10 Pro. I had some trouble getting the OS to install, a description of the issue I posted in this thread: https://hardforum.com/threads/trouble-booting-after-new-gfx-install.1966980/ In a nutshell, with the new graphics card in the PC, the computer would post, but restart just before the windows installation and after I got windows 10 to install with my old graphics card. I put the new card back in, the PC would post, but restart just before windows would load. And this boot loop would just keep going. Well, I finally got the PC to boot to windows 10 with the new graphics card after I removed 2 of the 3 memory modules just leaving one in. I tested each module in the first slot by itself, and the PC would load. The PC would also load with a memory module in any of the 3 memory slots. I even tried 2 modules in different slot configurations, but it still would not load. It will only load with one. Mind you, the PC would load just fine with the old graphics card and all the memory modules installed. Anyone have any ideas why the new graphics card will only work with one memory module? Should I buy 3 new sticks of memory? Or is this a mother board issue? Any help or suggestions would be appreciated. Thanks in advance.