Default [Q]bootloop when going to new ROM

hi,

i wanted to flash a custom rom(SOKP). so first i did a factory reset, then i tried to flash the rom but it aborted. i wiped cache and tried to boot my phone up because i wanted to install a different zip(maybe something went wrong while downloading). now my phone does not boot any more. it stays in the PA bootanimation. my pc does not recognize the phone anymore. it can only go into fastboot mode and recovery mode. another factory reset doesn't work. what can i do now?

greets, jamie