mac pro early 2009 won't stop rebooting
Greetings kind folks. My beloved cheese grater mac pro early 2009 does not stop from rebooting every 5 minutes. I adore this machine and would like to keep it going. Any suggestions on how I can go about troubleshooting and fixing the issue. I have done the following with no progress:
• shocked PRAM
• started in safe mode
• replaced all RAM with new (it was showing it stopped recognizing one slot, so I replaced all to make sure)
I have replaced the current HD with an SSD, but that happened ages ago and only recently am I dealing with the reboot issue. Any suggestions on steps to troubleshooting would be seriously seriously seriously appreciated.
Mac Pro, OS X El Capitan (10.11.6), (Early 2009) 2x2.6 GHz Quad-Core