Start Up hangs - My Mac Pro won't turn on

After upgrading, my Mac Pro won't start up.  Does any one else have this problem...   I can't get my Mac to start up...  HELP!

More information on what the 'upgrade' was and which MacPro would be helpful.  With that said -
If it worked before the upgrade and does not work now, the first thing I would do is think about what changes were made.  If hardware, is/are the component(s) installed the proper ones, designed for Macs and for you Mac?  If satisfied with the components being the right ones, I would look at the installation process.  Is everything seated properly and in the correct location?  Are any power cables connected?  Were ESD protocols followed?  Next I would run the Hardware Test included on the Installation Disk.  Reporting those results here may help.  (Note: this may not find a video card problem). 

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