I have a hp pavilion zv5000

My windows xp install died and I made a Ubuntu USB install (13.04 32bit) with unetbootin when i start my computer the unetbootin screen appears and i press install Ubuntu and the purple screen appears with the ubuntu logo in the middle the circle dots underneath the Ubuntu logo flash go through two cycles at least the stop and the USB stick stops flashing.

I have tried a few times and also tried mint with the same effects.
I left it overnight and it stayed at the same screen

Any help would be appreciated

Thanks