MacPro (2009) isn't working after I tried to reinstall the original OS.  I was previously using Mavericks before I reinstalled the original OS.

My MacPro (2009) was running on Mavericks OS and I was having some issues with it so I tried to reinstall the original OS X which came with the laptop and then I was going to upgrade it back to Mavericks.  In the process of doing so, the computer isn't working properly anymore.  The install of the original OS X worked just fine and then I installed the Applications CD which came with the computer (iPhoto, Garage Band, etc.).  Once the applicaiton install CD finished (which was sucessful), it prompted me to restart the computer.  After restarting the computer I was unable to open anything (Safari, Calendar, iTunes, etc).  So I tried to restart the computer and now it won't even being me to the login screen.  I have tried to restart the computer several times and it just shows a blue screen and never brings me to the log in screen so that I can continue upgrading it to Snow Leopard and then to Mavericks.
Please help.  I would appreciate any feedback.  Thanks.

Boot an external Mavericks USB disk, wipe, and install, and see if Mavericks works.  (There've been reports of problems with some Mac systems; of attempts at downgrades that didn't work.)
It's also possible that the original and unspecified issues with Mavericks were being triggered by a hardware problem, and the underlying problem is becoming increasingly pervasive.
If the Mavericks problems were potentially triggered by hardware, then load and run the hardware diagnostics for the Mac Pro, and see where that gets you.

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