Trouble uploading in Arduino UNO ( avrdude : ser_open () Can't Open Device.)

hi all,
i using arduino uno atmega328 r3 board.  it has been working fine days...
i playing liquid crystal library , have somehow gotten board mode can't upload new code.

i've tried upload basic code :-

code: [select]


void setup() {
  
}

void loop() {
 
}

but still cannot upload.
i've checked serial ports , updated drivers , seems fine.
oh! i'm using windows 7 ultimate version of os.
i've tried changing usb cable trying on pc,but still not working.
can please help?
did fry board or anything?


thanks in advance help.

try press & hold reset button. start download. when ide shows "compiled xxx bytes of 32xxx bytes" release reset button. 
if select file:preferences , turn on verbose outputs, timing of release can easier find.

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