Stuck on TWRP, cannot boot into OS

When my phone was running, it turned to black screen somehow. I was like "hmm, what is going on?" So i thought its time to install new cm, new rom.
I installed new CM13 by using TWRPv2.8.6.0, and it said "Successful". But when I reboot, it automatically goes to TWRP screen and cannot boot OS.
I did try to install different cm, rom, but its not working at all. Still keep going to TWRP screen.

Please help me out!