Mac keeps turning off during OS installation: from dvd and usb both

I'm trying to install a new ssd, and mac keeps shutting down while installing 10.6 from retail official dvd.
so I made a bootable OS in my usb in disc utility (the whole "source" and "destination" tech), but mac still shuts down while installing OS from it.
what is likely to be wrong?
Corrupt boot files made from corrupt dvd?
macbook 2007, 10.6 snow leopard

Format the external drive as Mac OS Extended (Journaled) - Partition Map Scheme: GUID
If the drive is not formatted as GUID, it's not bootable.

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