So a small backstory: I bought a computer two years ago, and made sure the one I got was able to be upgraded in the future. The computer I bought has a 2.6 ghz quad core, 2 sticks of 2G ram each (so 4G total) and some other unimportant stuff like a 1TB harddrive and good video card. Anyways I decided, thanks to an awesome coupon from newegg.com, to upgrade to 8G of RAM. So here is what happens: I bought 2 more sticks of identical ram to what I have, and I mean identical down to the part # and company. They are completely the same: DDR3 1333 2G x 16 U-Dimm company is ADATA. When I leave the original RAM in A1 and B1, the computer boots fine with 4G of RAM. When I replace the two original RAM with the two new RAM in A1 and B1, the computer boots fine with 4G of RAM. When I mix 1 new and 1 old RAM in A1 and B1, the computer boots fine with 4G of RAM. But, whenever I try to mix and match any combination using A2 and B2, to hopefully get 8G of RAM, or even just leave A1 and B1 empty and put the RAM in A2 and B2, the same thing happens: The computer turns on, makes a few noises, but never makes that beep sound that it has loaded and my monitor never does anything. If I go back to A1 and B1 it continues to boot and function normally. My motherboard says it supports up to 16G of RAM, so that shouldn't be the problem. The make of the motherboard is P7P55D LE. The computer is running Vista 64 bit. If anyone has any suggestions please let me know thanks!
have you updated to the most recent bios? P7P55D LE Version 2003 2011.01.17 update 1. Improve memory compatibility 2. Improve system stability 3. Update CPU Level up function 4. Update Marvell Option ROM 5. Support new CPUs. Please refer to our website at: http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us http://www.asus.com/Motherboards/Intel_Socket_1156/P7P55D_LE/#download make sure you have AI Overclock Tuner set to Auto and not XMP in your bios. if your certain the memory are identical to the T you could try setting the timing manually and then try all 4. have you read your motherboard's manual? read up on this if you haven't already and see if this helps. you can get the manual from the same link above if you don't have it. here it is again: http://www.asus.com/Motherboards/Intel_Socket_1156/P7P55D_LE/#download
Hey thanks for all the help! Embarrassingly enough I figured out the problem. It turns out I was just barely not getting the RAM all the way into the slots even though the locking mechanism was clamping them. My only guess is that its because nothing has ever been used in these slots before. After taking a flashlight really close to the RAM i noticed about 5 of the connections I could still just barely see. I managed to fix it by shoving the bottom side in, holding it, and using my other hand to shove the top in which locks it. I'm not sure why it was doing it because the other 2 slots where the original RAM was were very easy to take in and out without any issues. Anyways, its fixed and my computer is showing 8G of RAM now =) Thanks for the help though!
yeah sometimes those ram slots can be a bit stiff and require a great amount of push force. a little flexing of the motherboard from pushing doesn't hurt. when i say little i mean slight not snap it heh.
