08 Gmc Arcadia Headlamp bulb replacement can damage my dashboard cluster or not?

What is your question?

A tech replace a light bulb that I bought this morning. He didnt remove the tire but unscrew some bolts from wheel cover and sticked his hand to replace the bulb. But this afternoon, my dashboard cluster is not working. All gauges dont move and the lights keep dimming even after the car is tuned off. Moreover all my interior lights were one but mechanic found out my liftgate was not closed properly! Ooops Is this problem related to the light bulb change? Or not? Also i dont know the location of my battery! Thanks