Unable to transfer sketch to Arduino UNo R-3

I am trying to upload sketch to Arduino UNO R-3 but every time i get the same error

avrdude: stk500_getsync(): not in sync: resp=0x00

Now while this happen , On Arduino UNO board, LED “L”, keep in ON state continually and RX led blink for 3 time and nothing happen.Even when i am pressing reset button nothing happen, though i was expecting that POWER led will Blink for once along with L led.

After going through net i found that this might happen due to the fact that either my Chip had fried or bootloader is corrupted.On the other hand i had cross-checked all the connections and options in Arduino IDE. i.e. Board , COM port, Programmer etc.

need help, i had 2 boards and both of them are showing the same thing.

You could buy the ATmega328P (the controller on the Uno R3 board) already with the bootloader on it. Then you have a working Uno board (if the rest of the hardware is ok). Then you can write the bootloader to the other two chips again or you can check e. g. the fuses of the chips.

To write the bootloader again to the ATmega328. Look at:

Arduino homepage: http://arduino.cc/en/Tutorial/ArduinoToBreadboard

Nick Gammon's pages: http://www.gammon.com.au/forum/?id=11637

and also in my blog: http://heliosoph.mit-links.info/arduino-powered-by-capacitor-start/