I have attached a screen capture. In this test, I flipped switches SW1, SW6, SW7. As you can see, the buttons below SW6 and SW7 also darken when SW6 and SW7 are flipped. So as I said, when I flip any of the last 4 switches (SW4 - SW7) on the board, on the screen the switch is shown correctly but the button below the flipped switch also darkens.
Pressing the buttons (BTN0 to BTN3) has no effect on the screen display.
I have not tried any demo code. Do you have something I should try?
I did have a class assignment that utilized the switches and the LEDs (LD0 to LD7). The card worked correctly when I used the first four LEDs (LD0 to LD3).
But when I used the first 6 LEDs (LD0 to LD5), LD2 and LD3 no longer worked - they stayed off during any movement of the input switches. My professor tried my code on his board and it worked perfectly.
My second assignment utilized the switches (SW0 to SW7) and the display (AN0 to AN3). I had no problems.
So my problem seems to be that the LEDs do not work properly, maybe only four can be utilized at a time - I don't know. Also the buttons don't work, as per the test.
The switches are already very clean. As I said I just got the board and I keep it stored in the case when not in use. I have had the problem since I took it out of the box.