Default Help booting into recovery

When i flashed the twrp recovery using this (http://forum.xda-developers.com/show....php?t=2449670) then i updated it to 2.7.1.0.

it was working fine until i decided to boot into it again, and it wouldnt, it would show the lg logo then go blank. if the phone was connected to my pc, a load of drives would show up.

I am on VS980 24a