Hi, my pc gets shutdown atonce after connecting lan cable.

Tried following steps

changed lan cable, still it shutdown after connecting.

Disconnected main fiber cable, then connected cable to router and to pc, then also pc got shut down.

It's Jiofiber router, Got router replaced by company 3 times. Everytime, they gave new router but issue is same.

Purchased  pci card and then tried but still pc got shutdown