Share your experience!
How do I get to taking photos?
Please, explain your question. Otherwise this is the simplest answer: use an iphone camera to take photos 😅
The whole screen is showing, the battery is fully charged, and the 'O' is flashing.
That's it, I don't know what to do to stop the 'O' flashing and set to take photos.
Does the manual for the camera not have any reference to what this O means, have you looked under
the troubleshooting section.
You really need to give us more information than you already are, we cannot read your mind or see your cameras screen.
For example you haven't told us which Sony camera you are tempting to use.
Have you taken the lens cap off?
Can you use your camera phone to take a picture of what the screen is showing
and post the image back here.
Where in this thread have you previously mentioned that it is a Sony A900.
Have you done all the basic checks, SD inserted, SD formatted correctly, make sure the SD card is not locked (small switch at the side of the card), SD card not full.
Have you powered off and turned on again.
Do Sony lenses need to be rotated before they can be used.
Here is a link to the online manual,
https://www.sony.com/electronics/support/a-mount-body-dslr-a900-series/dslr-a900/manuals