Memory is not detected.
Dirty on pins memory can make computers work slowly, often hangs, or computer even die at all.
The creative way and simple but have a good result is by using an eraser ( rubber ) of your stationery.
Use an eraser as used when deleting the words on paper, until the pin surface is really clean.
|Cleaning memory pins using the rubber eraser|
Also clean the remains of rubber is produced when cleaning..