Hi,Depending on how wet the camera was, it has probably not been sitting long enough for all of the internal parts to be completely dry. The rice drying is a good idea, but it can take as long as 3 to 5 days to remove the internal moisture that can harm the internal parts if it is sealed in a ZipLock type bag with the rice. Your efforts may also be ineffective if you did not remove the memory card and battery. When you are sure that the camera is dry, clean the contacts, battery compartment, lens & camera body, to remove any remaining moisture and help arrest corrosion. Do not try to turn it on again without the extended drying time since the processor board can be damaged by a short circuit. When you are ready to power it on start with the camera body only. add the memory card as the next step, then the lens.
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well.If you require additional information, please use the Reply to Expert Tab to contact me. Click the ratings only after our exchange is complete and you are satisfied.If you are satisfied that my answer is accurate, please do not forget to rate my answer OK, Good or Excellent.Thank you
If it will not even power up after making sure that it is completely dry, then it is probable that an internal power supply component is damaged or possibly corroded and will require professional service. You can use Canon at the link below
Or a less expensive 3rd party service like United Camera at the following link.
If you require additional information, please use the Reply to Expert Tab to contact me. Click the ratings only after our exchange is complete and you are satisfied.If you are satisfied that my answer is accurate, please do not forget to rate my answer OK, Good or Excellent.Thank you