I just bought my Arduino uno and I have a problem with the visibility on my computer. when I plug it in my pc don't recognize it, the only way my computer to see the port that Arduino is, is by holding pressed the reset button and the Arduino down (to the table).
Is it an original or clone? Many clones use CH340G (look at the chip near the USB port) serial adapter - the drivers for that aren't included with the IDE.
Have you installed the driver?
What OS?
Have you looked in device manager (if your OS is windows)?
Have you checked the troubleshooting guide?
I downloaded the program, went to device manager and couldn't find the port for Arduino. then I hold reset button and Arduino chip down and the device manager recognized it, then I updated the drives and after that I stopped holding the Arduino and the port disappeared.
Is it an original or clone? Many clones use CH340G (look at the chip near the USB port) serial adapter - the drivers for that aren't included with the IDE.
I cant understand what do you want me to check, I upload the picture of the Arduino front and back to tell me if you recognize it