I put14500 batteries on board and plug usb in the uploader, the power light is on, and 2 lights blink for 1 second and dim, also hear some beeps. Then I test the uploader, the picture is the result I get. Yesterday I tried Mac, and failed to upload, it displayed the port was busy. When I changed to Windows system, and upload some tests successfully( testbuzzer,testled) , but when I uploaded writeinstint, it was wrong. Today the conditions are the same on Mac and Windows, all the uploading tests don't go through.