I've checked the threads on this problem but I can't seem to find a solution or pinpoint the problem. Basically my PC only recognizes half the memory installed. It says in my bios that 2gb are usable and in Windows 7-64 it basically says the same thing and that 2gb are "hardware reserved." But I'm pretty certain it is a hardware issue. Whenever I insert one stick into the 2nd slot dimm, the PC will not boot but if I install it in the 4th slot, it boots just fine. So basically I know the 2nd slot is the problem because both stick will not work in there. But the strange thing is, is that I've tried this on two different mobos. First a Gigabyte GA-P55-USB3 (same problem) and now with my ASUS. I thought perhaps the G.Skills were incompatible so I swapped them out with a pair of Patriot Sector 5 DDR3 1600 CAS9 sticks but with the same exact issue (2nd slot is not functioning properly). My only guess is that the perhaps some of the pins are bent in the socket. But I know I didn't install the CPU incorrectly, I made certain that I was extra careful. Followed installation down to the letter. Is it a bad CPU Memory Controller or bent pins?
Intel I7-875k 2.93GHZ
Cooler Master Hyper 212 Plus
ASUS 1156 P7P55D-E LX
G.Skill Ripjaws 1600 CAS7 4gb (2x2gb)
BFG 896mb GTX 260
Corsair 650-TX 650w
Windows 7 64 Home Premium
Intel I7-875k 2.93GHZ
Cooler Master Hyper 212 Plus
ASUS 1156 P7P55D-E LX
G.Skill Ripjaws 1600 CAS7 4gb (2x2gb)
BFG 896mb GTX 260
Corsair 650-TX 650w
Windows 7 64 Home Premium