When I turn the camera on, the image that I am shooting does not show on the LCD monitor. When I switch the camera mode to view images I have taken previously, they show up but the new images are not showing (they are completely black) Can you help?

There are many point you may want to look at.

first, if the LCD does not display the picture you just capture, there is a possibility that the digital module of the device is broken and that it does not show or save the pictures you have recently captured.

if the pictures you recently captured can be viewed on a computer, there is a possibility that the connection between the LCD and the camera is loose. we canot say that tha issue is the LCD since it displays previoulsy captured image.

to work around the issue, it is best if you visit a local repair shop or a technician to have a look at the unit and have it repaired.

as per the cost, it will actually depend on the damage of the device. you may want to put a new camera as one of your options.