L led is always on

Development Tools IDE 1.x
1

Hello everyone,

So I've recently gotten an arduino UNO and I followed all the driver installation instructions but somehow the L led stopped blinking the from the moment I connected the board to the PC (I know that it used to blink because I connected it to a DC power supply before connecting it to the computer). Now it doesn't matter which power supply I use, the LED is just not blinking. I'm also facing a problem with uploading the sketches, so whenever I press upload, I get this error:

avrdude: ser_open(): can't set com-state for "\.\COM5"

also when I press upload the TX LED lights up (sometimes, not every time)

I would really appreciate it if someone can help me.

2

Is this a new board?

If so where did it come from? (Post a link, we may be able to see something about drivers etc).

Have you ever loaded any programs on to it?

Does com5 appear under tools->port when the board isn't plugged in?

3

Have you connected any sensor to Tx & Rx line. If yes,just remove the Tx & Rx line upload the code.

Also make ensure you choosen right board & right port while trying blink example.

let us know with screen shot of error message you got.