You can go back in recovery by pressing and holding Volume+Up buttons.
Then in recovery wipe
cache, dalvic cache, system and reinstall ROM and correct GApps.
Now if you have ROM and GApps inside the phone its fine. Else you may have to use ADB if your PC doesnt recognize the phone.
Set up ADB using link above and download both ROM and GApps in your pc.
Restart phone in recovery mode.
Connect phone to PC. Open CMD and run these commands->
adb push Path_to_ROM_File_and_Name.zip /sdcard/
adb push Path_to_GApps_and_FileName.zip /sdcard/
- These commands will transfer both ROM and GApps to your phone which you can normally install after wiping
cache, dalvic cache, system (as already told above).
Hope this helps.