After updating today MacPro with OS 10.7.5 will not restart, can someone advise what to do?

Had an OS update today, from OS X Lion to ver 10.7.5 which needed to restart to install.  My computer will not restart.  Have MacPro.

Ok so here's what happened. My machine has 8GB Ram. We tested the Ram and moved it between the cards & slots in the Mac in various combinations. As far as we can tell Ram is fine. We removed two sticks of Ram and now the machine runs with 6Gb Ram... At a loss to explain why but the machine is now running again and seems normal if a little slower. Will continue to run with 6 and see what happens.
Regards
T

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