I built the machine about 16 months ago and ran fine and long story on how I reached this point but I am at this point.
I am getting NO BEEPS to help me diagnostically.
I even had the MB and Power Supply replaced.
Before I replaced MB, I just plugged in the power cord and 4 wires (HD,RES,POWER,....) while it was out of Antec chassis
and still no beep. I haven't tried this with replacement yet. Gigabyte even told me the original board worked.
There are cases where faulty power supply could cause problems.
I unplug the Graphics card and memory completely and st6ill no beeps to indicate missing memory or graphics.
THEN
I tried just putting in only first memory stick in slot 1 and still no beep.
I tried just putting in only second memory stick in slot 1 and still no beep.
I think the CPU fan should only start up if the CPU reaches higher temperature and should turn on and off accordingly.
The CPU fan is plugged in.
In the old MB board, I tried re-seating the CPU.
Without any memory or graphics card on board, I am down to focusing on
1) CPU seating
2) Trying MB out of the chassis and unplugging everything except power cord and 4 wires (HD,RES,POWER,....)
3) Power supply
I've came across a 2009 post on tom's hardware where more than a few people SEEM to have somewhat similar problem of NO BEEP although no solution was posted. Their computers worked fine for a year or more and then all of a sudden theyt stopped working and NO BEEPS. One guy had it happen to two different computers in home around same time.
I've been at my wits end.