So I've set up the blink experiment using my newly bought electronics kit for my RPi 3B+ (https://www.amazon.de/Freenove-Raspberry-Processing-Tutorials-Components/dp/B06VTH7L28/ref=sr_1_3?ie=UTF8&qid=1551726501&sr=8-3&keywords=freenove+rfid). I ran the program and it worked and then I accidentally clicked CTRL+ALT+F2 on my VNC and it became black. To try to fix it I plugged in my keyboard and I think something white sparked in the RPi. Suddenly as I plug it in the project stopped blinking... Can it be I fried my GPIO pins? I was using the 17th pin. I ran the experiment thru a extension board and the connector might've been connected not so tight and touched the nearby pins, but it's very unlikely. How do I check which parts did I fry? I tried changing out the LED, but that did not help. Help?