3DS + 2DS (All Versions)

Problem Description	Symptoms	Solution	Source
No power.	- Blue light blinks on then turns off instantly. - There may be an audible pop noise.	Indicates that a hardware check has failed. The check includes: Upper LCD, Lower LCD, Lower LCD backlight, and speakers. Reseating one of these cables will likely fix the issue. If it does not, one of these components is likely defective.	Source
No power.	- Blue light blinks on then slowly fades out. - There may be an audible pop noise.	Indicates a software failure. - If the system is softmodded, the presence of an SD card with the correct files on it may be necessary for the system to boot. - Try without a game cartridge. Some unlicensed game cartridges may draw excessive current and cause power issues.	Source
No power. (2DS XL)	- Blue light blinks on then turns off instantly. - There may be an audible pop noise. - There may be a flash of light from one or both screens.	- Indicates that a hardware check has failed. The check includes: Lower LCD, Lower LCD backlight, Upper LCD, Inner Camera, and the Battery. Reseating one of these cables will likely fix the issue. If it does not, one of these components is likely defective. - Can also be caused by a shorted volume slider. On each of the short sides of the slider are two pins. One of these pins is always grounded, and the other should vary in resistance when the volume is changed. If both pins are grounded no matter where the volume is set then it is not working correctly.	Source
Game Cartridge not detected.		- Some games like Omega Ruby/Alpha Sapphire are known to fail. Test with a known good cartridge. - Check for bent pins inside the cartridge reader. Replace if damage is present.	Source
Not charging. (May be 2DS XL specific)		Blown fuse near the charge port.	Source
Shoulder buttons are reporting false inputs		Replace or reflow the shoulder buttons.	Source