I can't see a reason, although Toshiba's are notoriously finicky when it
comes to Linux in my experience. You do not mention video memory and this
could be a key determiner for video editing.

what would be the minimum neede to do 720P editing.

This is the system requirements
www.kdenlive.org/.../recommended-hardware

However, things can be okay, but still not fun. The more the better. Note
there are two levels of requirements. Semi-professional requires more. You
may be in that category if you are trying to do HD.