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Causes of crashes[edit | edit source]
Crashes are unexpected shut downs of Minecraft. When Minecraft crashes, it typically closes immediately, though it may show an error report marking the location of the exception which caused the crash. A sign of a crash is a "Saving chunks" or "Shutting down internal server" screen. The most common cause of crashes are mods and preexisting bugs. Mods can crash the game due to certain mods not being able to work with each other or the mod not being made very well. Attempting to modify the files of Minecraft or individual worlds, even with advanced editors, can also cause crashes. Crashes can also be caused by bugs in the game (e.g.: before the beta 1.6.5 update, shift-clicking an item into a full chest would crash the game.) Crashes can sometimes cause the corruption of save files if the player is not careful enough. Because of this, it is highly recommended that you regularly keep a copy of your save folder (located in the %appdata%/.minecraft directory on Windows systems or ~/.minecraft/ in linux), to reduce your losses should a world become corrupted as a result of a crash. Large TNT explosions can also cause crashes.
Crashes used to have an error report but that feature has been removed. Yet sometimes an error report can quickly flash right before the game closes. Minecraft occasionally will do this on startup, except it stays there, not allowing you to play the game.
Hardware problems[edit | edit source]
Problems with your computer's hardware can also easily cause crashing, or buggy behavior. If this is the case, it's likely you're experiencing problems in other, unrelated games as well. If Minecraft is the only game experiencing issues, then it is unlikely to be a hardware issue.
If you are indeed experiencing crashing or visual corruption in other games as well, the first thing to check is whether your computer's vents are blocked, or clogged with dust (which inevitably occurs over time). Dust or vent/fan blockages can cause overheating, which may not be severe enough to cause problems during normal computer use, but during more intensive activities such as gaming, the temperature may spike. If you're using a laptop, make sure any vents on its sides or bottom are neither blocked or filled with dust. For a desktop, check obvious fan locations for blockages, and use a flashlight to peer inside the case. If there is lots of dust, or any internal fans appear to not be spinning, you should either take your computer to a repair shop for a "tune-up" (mention that you suspect there is overheating problems), which you will have to pay for, or read a few tutorials online related to computer cleaning (note that a computer's internal components are highly sensitive to damage from ESD (Electrostatic Discharge, basically a static shock), so it would not be difficult for you to accidentally damage your computer).