My Minecraft launcher wont open [duplicate]
Solution 1:
Step 1
Go to your Minecraft data folder.
Windows: Press Win (Windows Key) + R. When you see a box pop up, type in %appdata% then press enter. You will then see a folder pop up. Find the folder called .minecraft.
Linux/Mac: Refer to this article.
Step 2
Reset your .minecraft folder
Once you see your .minecraft folder, right click it and select Rename. Rename it to minecraft_backup. Please note that this will reset your settings, texture packs and worlds. To bring back your worlds, move the saves folder from the minecraft_backup folder to the new .minecraft folder.