I did have the camera on the highest ISO mode 1600

and didn't even know it.
I do that too, when I change settings. I try to leave it at ISO 100 all the time, but there are situations where I need to change it.
What is the Av mode? Thanks for all your help!!!
It's called Aperture Priority mode. What it means is that you get to set how big you want the hole in the lens to be during a shot. The camera then adjusts how long it is open, automatically.
"Why would you do this?", you ask. To control the part of the picture that the camera keeps in focus (called depth of field, but that's irrelevant right now). This helps give you different moods to the image. It's fun to play with, but because you have a point & shoot camera (I have a dSLR), you won't see alot of difference in setting changes. But, you can try to see a difference by doing the following:
Take a picture of something close, like a flower, with a cluttered background, like a stand of trees at least 20-50ft or more away. Set the camera on your tripod, set the mode to Av and the aperture to the smallest number on the dial. Take a picture of the flower. Now take the same picture but change the aperture to about the middle of the range. Then take one more with the largest number. You should see a big difference in the background.
Just know this. The more you know about this stuff, the more you will want to do with your camera. The more you want to do with your camera, the more you'll find you can't do without an upgrade. The more upgrades you get, the more you'll need a new camera. The more camera you get, the more upgrades you'll need. The cycle never ends!