arduino Nano V3.0 leds

Hey,

I was making a circuit and writing a simple code (I am new to coding so im learning) and when I put my arduino in my pc. my pc detects that my arduino is going in and out and in and out and never stops untill I dusconect the cable. Now when I connect it again, or only the PWR led stays on or PWR, RX and TX stay on and my pc doesn't detect a new input to my usb. I also can't upload my sketch, there is nothing to uplaod to.

Can someone help me? Thanks!

It sounds like your circuit was drawing too much current. Does the problem still happen if you connect the Arduino alone to your computer, with no external circuitry, shields, components, etc. connected to it?