Can't run or install Zorin 12.2 Core

Hi,
I am trying to run Zorin on a customers HP laptop (not sure of the specs but it's quite new - 6Gb Ram, 500Gb HDD) from a pen drive. I can get the laptop to boot from the pen drive, and I get the Zorin logo which pulsates for a while and the activity light is flashing on the pen drive. After a short period the pulsating of the logo stops, the activity light goes out and I have to hard reset the laptop.
I tried installing rather than just running from the pen drive and the same thing happens.
Any idea what I can do to make it work? I've turned off secure boot in the BIOS just in case but it didn't help, and the pen drive is the one I used to install Zorin on the computer I am using to write this message.
TIA

Hi, What OS is on the HP Notebook at present? Is it to be a dual-boot? Also what processor is in the Notebook - some Intel Processors can be a pain when it comes to GNU/Linux. I always install from the live desktop to avoid issues but you aren't getting there - the other general issue with HP is that they usually max out the hard drive with 4 Primary partitions - hidden partition to boot to Firefox etc without booting the OS, C:\Drive, Recovery Partiton, Recovery DVD creation partition. One of the partitions is going to have to go in order to create an Extended partition by shrinking C:\ drive if dual booting. If Windows 8 or above, advanced Power Settings that are hidden will have to be turned off - this is what puts the hard drive into sleep state so that when you boot it will boot to Windows instead of your other device.