Exclamation [Q] HELP! My phone doesnt recignize SIM card

Hello everyone!

I got some really heavy problems. After I flashed custom rom to my S3 (i9300) my phone doesn't recognize SIM card. I flashed Pardus HD RoM and it worked fine for almost month, but when i tried to flash CM 11 nightly and it failed, it just doesn't recognize my SIM. I restored backup, but nothing changed.

I DON'T have backup of IMEI right now, but at home, it's written on paper. Can someone please help me, because I really need phone working fast??