How would I know if I bricked my switch

My switch died and won't come back on no matter what button combo I try. I've left it plugged up I tried plugging it to the computer and I was able to inject a payload but it died after the atmosphere screen popped up and now it won't come back on. I took it in for repair and they told me my m2 chip may need to be replaced because it's getting power but not knowing what to do with it. What should i do and also how would I know if i bricked it?