I'm used to seeing Windows report around 3 GB of available memory, out of my 4GB installed memory. I don't know when it started, but today I just noticed it is reporting only 2GB of available memory.
A few days ago I had to manually start memory compatibility tunning on my ASUS P7P55D-E motherboard. The constant power failures at my location have probably been stressing my motherboard electrical components. I can experience an average of 2 power failures a day and have been experiencing this for close to 2 years, for a potential 1,200 power failures suffered by this machine.
Memory Compatibility Tunning is started by pressing the MemOK switch on my motherboard, when the system cannot boot due to memory issues and the MemOk! light on the motherboard stays red. So far, this process has allowed me to boot the machine.
However, I now see only 2GB available memory. Shouldn't my system report an error in case of a DIMM failure. I have 2X2GB dimms installed.