arduino board

hi,im new in arduino. can anyone tell me what happened to my arduino?when i connect the arduino with usb, the TX,RX and ON light up without blink,and the L blink one times. the usb port cant be detected.May i know why is this happened?

You may need additional drivers if it is a clone board as the IDE does not come with those drivers.

Google "CH340"

You may also want to read this post as I am only guessing based on the information you provided.