Could be the graphics driver trying to be used.I tried booting the new CD on my Toshiba Satellite C75D-B7215 laptop, which is about 2 years old, has UEFI boot, AMD A8 64 bit quad core 1.5 GHz processor, Radeon A5 Graphics, 8 GB RAM, 1 TB HD. The CD booted all the way to launching the xorg desktop, but which immediately exited,
Try this:
As soon as the CD boots to the Puppy boot screen Press F2 key and keep pressing it until the option screen pops up.
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puppy radeon.modeset=0