mobile

I just recently rooted my Galaxy S4 using Odin and then installed TWRP 2.6.0.0, I then tried to install this custom ROM http://forum.xda-developers.com/show....php?t=2557353 which is a Android Lollipop 5.0 ROM, I wiped the device using TWRP, followed every step right but when I rebooted the phone it didnt work and now Samsung Galaxy S4 GT-I9505 appears when I turn it on only to disappear in a matter of seconds, I can get to download mode and after a couple of tries recovery mode too, my computer doesnt know the phone is there when I plug it in either.... what can I do?! Sorry if I'm not making much sense I'm not too good at things like this :p