A thrilling scene, win7 64-bit system memory is not fully recognized

win7 64-bit flagship version, the motherboard is ASUS m5a97, cpu is amd 955. When changing cpu fan, the thermal grease and CPU stick, did not pay attention to the CPU to pull up a gap, and then installed the cpu fan, boot light, No problem, normal system, but found that I installed 4G memory can only recognize 1.96G, memory frequency is 1600 strips but shows 1333, into the BIOS adjustment, how to adjust does not work, empty bios is useless, motherboard memory Slot confirmation is no problem, the memory is new and tested no problem, finally consider whether it is cpu problem? Then open the chassis, take down the cpu and see, broken, the stitches are severely bent, how to do it, but also change the cpu, hug Try to see the idea, use the 0.5 oil pen to slowly fix the stitches, then install, test the machine, light into the system, find everything is normal, the memory is recognized, the overclocking is normal, this is relieved, after all, spent 800 yuan! Please pay attention to the hardware. In addition, if the memory does not fully eliminate the system problem, you can consider the hardware problem. If the new CPU has this problem, it is best to use the original cpu to plug in the memory and then change it.