No Sim Card Galaxy S6 g920f

Hello guyz i have a sm-g920f galaxy s6 just bought 3 days ago second hand its been great i flashed the russian update from sammobile and flashed the custom kernel to root it i used it till today when i plugged it in my pc to transfer a movie and removed it suddenly it tells me "Sim card inserted.Restart" I restarted but it kept saying no sim card
now i tried different sim cards from different operators but still nothing flashed so many other firmwares and still nothing so guyz plzz help me if theres any solution to this problem i dont understand it if it is software or hardware :crying::crying::(:(:(