My camera's photo quality was fine, then all the sudden it started to take blurry photos. I cannot figure out why.

The photos could be burry due to a poorly working eyepiece. Here is a link to repair guide for the Canon Powershot SX50 HS eyepiece. You might want to take a look at the Canon SX50 HS Troubleshooting Page for additional information.

It could be due to poor wiring inside the motherboard. Sometimes the motherboard can have a loose or bad wire connection. This could prevent the camera from turning on. I would also double check to make sure the batteries are fully charged. Here is a link to the Canon Powershot SX50 HS Battery Replacement Guide for additional information. Here is the Canon Powershot SX50 HS Troubleshooting Page.

First, I would make sure that the flash setting is on. If it is not on, then the flash will not work. Sometimes the flash will not go off if the camera battery is low. Therefore, try charging the camera and see if that fixes the problem. If those do not work, it could be an internal problem or the bulb burned out. Here is the Canon Powershot SX50 HS Troubleshooting Page for additional information.