EOS R10: Pictures coming out dark

[Avinash1]

I think a pressed the wrong button in error and now when I try taking a picture everything looks darker. When I click on the button to take the picture, the object that I'm looking at gets brighter momentarily and then it goes back darker. It only gets brighter when my finger presses down on the button to take the picture. The picture itself is darker than it should be. The camera was working just fine before and now this. I'm not sure what I pressed wrong or how to undo it. 

[deebatman316]

What mode is the camera set to (M, Av, Tv, P or FV) modes, Full Auto or any other scene modes. If the camera can't focus in low light it will temporarily increase the ISO to achieve focus. Can you show a picture of this screen below to help diagnose the problem.

Are you talking about the number circled in red.

[Avinash1]

Its on M ....don't know how to share a pic of the screen...im not good with technology. Its night now and I'm indoors...when i sent the ISO to auto ...it changs to 6400. 

[Avinash1]

changes to 6400 when i try to take a picture...i dont think its the problem though....i just think i pressed some button in errror. 

[deebatman316]

Did you add exposure compensation if so the light meter won't be in the middle. It sounds like you may have added negative exposure compensation. Are you using the built in flash or an external speedlite/ flash. If an external speedlite is it a Canon brand speedlite or is it a 3rd Party speedlite. You can just take a picture of the rear LCD Screen with your phone. Is the final picture correctly exposed or is it underexposed or overexposed. The lighting must be low if the camera is increasing the ISO to ISO 6400.

[Avinash1]

I don't know if I added exposure compensation. How do I check this? I don't have the flash on. Its night here and I'm in a lit room. The final picture is dark. I'm not sure if its exposed or under or over. I am new to using cameras. When I try taking out a picture now..its completely black....ISO 6400, 1/640 F11

[Avinash1]

When I tried using the flash just now the pictures are almost black. 

[deebatman316]

I don't recommend new users start with Manual Mode. Instead start out with P (Program) Mode instead. Your exposure settings will give you an underexposed picture. You should see the light meter on the back of the camera make sure its not set all the way to the left. If it is the picture will be underexposed move the needle back to the middle which is 0. In order to do this press the Q button and drag the needle back to 0.

[deebatman316]

Do the pictures come out black with the flash on. Or when you look through the viewfinder it looks black with the flash on before the picture is taken. Exposure Simulation is DISABLED when the flash is used. The camera cannot predict how the picture will come out.

[Avinash1]

When I put it on P mode I don't have the problem again, and the pictures are find.  But when I put it back to M the problem returns. Why is that? How do I fix it so the problem doesn't occur when in M? Thank you.