During the console's lifetime, the NES became notorious or even infamous for what is known as the "blinking screen." When a cartridge is inserted into the system and does not make a proper connection, the tv screen will flash random colors on and off, indicating a connection problem. This also happens when there is no game in the system. The pin connector that was used in North American models was prone to dust and dirt, causing boot failures or visual glitches in games. Nintendo later released a cleaning kit in the late 1980s to address this problem.
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