Memory problems are less common than other computer problems because memory sticks have no moving parts and thus fewer points of failure. However, due to this many RAM problems go undiagnosed. Memory usually will last longer than other computer components.

Bad RAM is somehow harder to diagnose as similar symptoms may be caused by software problems, other hardware problems or even motherboard failure. However if you experience any of these symptoms, you should check for bad RAM before attempting any other troubleshooting. 

Symptoms: 

Windows doesn’t start showing different error messages each time. 

Windows crashes (blue screen) or freezes frequently.

Windows crashes as soon as you try to start a program.

Unexplained random crashes and freezes without error messages.

Laptop Slowdown or randomly restarts.