Have a nx9600 and when it tries to reboot, the hard drive light comes on, the 2 lock lights flash

At boot, the hard drive light comes on, the 2 lock lights flash simultanously (A and 1 ) , 2 of the 3 fans come on, then it appears to turn off. It will sit in a loop through the reboot process until the power and the battery have been removed.
Have replaced the drive and the center fan. The replaced fan is new and an HP fan. When I have been able to get it to boot , loaded windows and linux on the new drive.
If it sits long enough and you pray  it may reboot. Once I turned it upside down and it rebooted.
Have had the system up and running for hours with no problem, then have to reboot or a shutdown and won't reboot.
Suggestions ?

Install or Reinstall Mavericks or Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
OS X Mavericks- Erase and reinstall OS X
OS X Mountain Lion- Erase and reinstall OS X
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.

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