Late 2008 Macbook Pro doesn't boot after installing Mavericks

I have a late 2008 Macbook Pro, dual core 2.53 GHZ, 4 GB Ram (2x2).
I've been tearing my hair out trying to get this computer to boot up.  Many things have been tried here.  So here's the history.
Before starting this, I was running 10.6.8 on this computer.
First time I tried to install Mavericks, the installation failed, and when the computer went to restart, it just went in a loop, never really booting up, just getting the to gray screen with the apple symbol, spinning the wheel, and then going black again, restarting, and repeat.  So, I took it into the Apple Genius Bar, and they diagnosed a bad battery.  I replaced the battery, and had them do a clean restore back to 10.6.8.
I got it home, and tried to do an install again.  This time, I downloaded the installer, and put in on an external firewire drive, and attempted to do a clean install of Mavericks.  I ended up with the same boot failure problem.
I went back to the apple genius bar, and even though the diagnotics said my harddrive was fine, they said in the troubleshooting list, that the harddrive with the first thing they suspected.  So, I replaced the harddrive.  I did the Mavericks install again from an external HD, and for a moment, everything was great.  It booted up into Mavericks.  But, after my first restart, the problem was boot failure was back.
After reading a few articles, I tried booting in Safe mode.  That worked.  I also ran disk repair on the HD and it looked great.  Still, it won't boot up out of Safe mode.
After being very frustrated, I tried just installing snow leopard from the dvd, but the install keeps failing. 
Not sure what to do next. 

Micajah10,
rather than a hard drive problem, you might have a faulty internal SATA cable. Do you have an external disk enclosure, or a SATA-to-USB or SATA-to-FireWire adapter? If you can boot from your hard drive without problems when it’s external, but it remains problematic internally, then that could point to the internal SATA cable as the culprit.

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