i just got a new arduino mini, and for about a day or so, i was able to upload new sketches to it, but today it decided not to work. i have checked the wiring at least 5 times and i cant find anything wrong with it. the bootloader works i think, because the led on pin 13 that i attached lights up when i reset the board, but when i try to upload a new sketch, the tx light on the usb attachment blinks 3 times and then it doesn't load.
plz help