Root stuck on htc boot screen after flashing new rom :[

[miah789]

hi every time i start my HTC desire s after flashing a new rom it gets stuck on the white htc screen. i follow this guide to root and flash and for months its been going well, ive changed my roms many times, but now after trying to install a new jelly bean rom. evreytime i boot up the phone it gets stuck on the htc boot screen.

here is what i do when i flash a new ROM

extract the boot.img from rom i want to android tools folder (adb,fastboot folder)
wipe data/factory reset
wipe cache
wipe dalvik cache
install the rom i want
reboot into bootloader and enter the code: fastboot flash boot boot.img
it tells me its finished in cmd and then i reboot to get the same stuck white htc screen.

i can still access 4EXT Recovery

please help :[

im trying diffrent methods but cant find working solutions

thanks