What type of machine do I have?
Note the difference in the front in terms of the number of optical drive bays.
Note they are both tower desktop machines.
For PowerMac post here:
https://discussions.apple.com/community/desktop_computers/power_mac
For Mac Pro, post here:
https://discussions.apple.com/community/desktop_computers/mac_pro
For MacBook Pro, post here:
https://discussions.apple.com/community/notebooks/macbook_pro
The Mac Pro is a desktop with an Intel CPU.
The MacBook Pro is labelled MacBook Pro on the screen frame.
If you see no text below the screen, it is attached to a computer typically under the desk or on it.