Default S4 no signal...Help?

I finally got around to unboxing my S4 and foolishly took the update to 4.3 last month. I managed to root and install TWRP,
then sat it for a month till the battery arrived (Zerolemon 7500).

Okay, i loaded both Hyperdrive RLS15 and ShoStock..... phone operates fine, but when I insert my SIM,
it does know it's rogers, but NO SIGNAL.

Modem issue? I'm frustrated.........back on my S3 now.........

HELP??
Thanks Guys