Plug it back in make sure the wall input plug is not shorted aswell as breakers in the house! You can also get a volt tester to see if its the power cord and not the wii
If you are talking about the GameCube controller, there are controller slots on the top, when it's on the stand. (This is only available on certain Wiis. There are also Memory Card slots there.) If you are talking about the Wii Classic controller, plug it into the bottom of the Wii remote, where you would plug in the Nunchuck.
Have you tried to clean out the vents. You can clean out the vents by using short burst of compressed air. If you use canned air read all instructions on can before use for not to spray any liquid in the wii itself.
Is your wii in an enclosed area where it won't have proper ventilation or on carpet. If so remove the system and place it on a hard surface out in the open.
Do you have all licenced wii accessories. Like a gamecube controller, A/V cables, Power supply. If not try to replace them with official accessories.
Look for damage to the system and accessories.
Was you trying to mod your wii? If so you may have soft bricked your wii. You will have to reflash the firmware on the system to fix. If not try these.
1. Hold the reset button for 30 seconds while the system is on.
2. Hold the reset button for 30 seconds while the system is off
3. Unplug every thing and hold the power button for 30 seconds.
4. Take out the SD card and turn the system on.
5. hold the + - and A button at the same time.
Error Code 50300, 50301, 50302 It appears that your Wii console's Internet connection may be affected by wireless interference. Try the following: Change your wireless router's channel to 1 or 11 Changing the wireless channel on your router may help. Most wireless routers have a channel range of 1 through 11. The best channels to try are usually 1 and 11, as they do not overlap with other channels. Typically, the channel settings for your router will be found in the router's main "Wireless" tab. Where is your wireless router located? Move your router away from walls and off the floor and try to place it in a central location in your home. Also, keep it away from metal objects such as metal filing cabinets which can cause interference. Look for other devices Noise from cordless devices (cordless phones), or wireless electronics (wireless keyboards, headphones, cell phones), especially those using the 2.4GHz frequency, can interfere with your wireless signal. Also, older microwave models can cause wireless interference. Avoid electronics that use the 2.4GHz frequency, instead look for devices that use the 5.8GHz or 900MHz frequencies.
Check you settings and connection cord's if your using a land line
And if your using WiFi networks be sure your setting is on WiFi and also check your router connection
