C2100/FS12-TY orange fault light on

I have a C2100 with the 12 HDD bay setup, and I run FreeNas on it.  The last several weeks whenever it turns off I will have the green light on, the blue light on, and the orange fault light on.  When they are on it will not power on.  So far I have always been able to get them to go out eventually, although I don't know how, and I can get it powered up.  Once it is powered on the orange fault light will flash, but it runs completely normal.  Looking at the manual it says I can look up fault codes, but I am not running any software where I can do that.  Is there another way to find out what the fault codes are?  Or does anyone have any idea what this might be?  I replaced the coin battery, that did not help.  I noticed today that occasionally, but not always, I will hear the power supply fan running at a low speed when all the lights are on but it is not powered up.  This is driving me nuts.  I don't want to replace this thing, but I don't know how to figure out for sure what is wrong with it.  Thanks in advance :)