Boot loop in my moto g (falcon)

I had installed a custom rom on my moto g. The os was cynogen. I thought to try some other ones and in the process screwed the whole thing. The device is looping and even i am not getting access to the recovery so that i might have installed the previous os. However the fastboot mode is accessible and the device can be operated through the computer.
I am relatively a new member of xda and hardly know anyone.
So its a humble request to spare some moments for my problem to help me out.
Thankyou.