Hi Everyone, This is my first topic, I really need some help. I am working as an editor usually on Avid Media composer or FCP I've got a Mac Pro Mid2010. I recently updated completely my work station. - I installed OSX 10.8.5. - I setted up a new graphic card on a 16X slot (http://www.club-3d.com/index.php/products/reader.en/product/geforce-gtx-550ti.html) - I setted up an Allegro 4XUSB 3 card on a 16X slot - I setted up an Black Magic DLink Mini monitor on a 4X slot. Everything looks like it works pretty good but after maybe 45minutes I've got a complete freeze of the system... nothing about the editing software it is general... I have no idea of the diagnostic and I never had this kind of problem before. Does someone already had this kind of issue before?? Thanks forward! Nico.