Cannot boot to bootloader, fastboot or recovery
Turn off your phone and let it stay like that for 20 seconds
Then try the key combination again until the led goes blue (from pink)

If that doesn't works
Try flashing the cwm recovery image again manually using 

fastboot flash recovery nameOfTheImage


Or follow this link to download the boot.img file and flashing it via

fastboot flash boot boot.img


Link:- 
http://techbeasts.com/install-cwm-recovery-root-xperia-z2-2301a0167-d6502-d6503-d6543/

Hope this helps!