Arduino UNO not running code

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Hi all,

I used my Arduino UNO today and everything was working perfectly fine. Then I have seen that some of the sensors I was using were giving me some weird data so I wanted to perform some new tests to verify my data. Oone of the sensor was working perfectly fine but the other one was a mess. I tried to re-upload my code to the board and suddenly nothing... My code was supposed to print some data in the serial but it was blanck. I tried to re-upload the code and now my Arduino UNO gives me back an error while uploading on a 50% rate. I tried to upload the blink led code and nothing is happening, the led is not blinking but stays on.

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xb9

Do you know if it means I have kill my board ? (the sensor that was giving weird results could have cause a short circuit).

Thank you for your help.

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Do you have all peripherals unplugged from the board and you're testing it stand alone?

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Yes !
Also I tried to connect RX and TX together, Reset and GND together and test if the serial is working which it does

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