Q: Hello. some problem with the Mac Pro

Contact Apple

http://www.apple.com/contact/

What Mac Pro do you have?

Mountain Lion will not run on the late 2013 Mac Pro, and the 2006 and 2007 Mac Pros without hacks for these tow older models..

You Bing and bingo!

http://www.everymac.com/ultimate-mac-lookup/?search_keywords=A1186

http://www.powerbookmedic.com/manual.php?id=100

http://www.apple.com/support/macpro

Lion is $19.99  http://store.apple.com/us/product/D6106Z/A/os-x-lion

Yep, you have a 2006 Mac Pro and the only way to run higher that Lion is to use a hak

https://discussions.apple.com/thread/6009611

http://oemden.com/?page_id=531