Dirty, aging, and bent connectors would often disrupt the timing, resulting in the blink effect. Alternatively, the console would turn on but only show a gray or green screen. Users attempted to solve this problem by blowing air onto the cartridge connectors, licking the edge connector, slapping the side of the system after inserting a cartridge, and/or cleaning the connectors with alcohol which, observing the back of the cartridge, was not endorsed by Nintendo. Many of the most frequent attempts to fix this problem ran the risk of damaging the cartridge and/or system.