Why won't my Sony Cyber-shot DSC-W800 power on? When pressing the power button nothing displays on the screen and the...

The wide variety of issues that could be preventing your media card from functioning properly are as follows: The media card... (1) is not supported by this camera (e.g. supported type, capacity, etc.) (2) is inserted in a slanted or improper position and may need re-positioning (3) terminals are dirty and require cleaning with a dry cloth or cotton swab Check your device and see if these may pertain to your specific issue. If not, the media card may be damaged and be in need of replacement.

This error code could be related to the flash feature of the camera. I would suggest to reset the camera to the default factory settings. You can do this by going to the [Menu] and, then going to the [Main system Settings] and, pressing [initialize] to reset camera. Also you can do a hard reset of the camera by taking out the battery and holding the power button for about 15 seconds. After that, you can return the battery to the camera and power it back on. If that does not work there could be a hardware issue and require a replacement of the motherboard. For instruction for replacing the motherboard and troubleshoot refer to: Troubleshooting Page