[SOLVED] PC won't post. Troubleshooting steps included

[rwayne]

PC won't post. PC worked flawlessly for 7 years until last week.

Specs:
Gigabyte GA-990fxa-ud3 motherboard
AMD FX-8370 CPU
8 GB of Cosair Ram
XFX 750 PSU (80 Gold Rated)
XFX R9 280 graphics card
100 GB SSD
1 TB hard drive

Troubleshooting attempted to this point:

1. Reseated the ram
2. Tried 1 stick of ram only
3. Moved the 1 stick of ram to the other channel
4. Tried the other stick of ram by itself
5. Moved that ram to a different channel
6. Reseated the CPU and reapplied thermal paste
7. Changed video cards (swapped the XFX R9 280 for a known working XFX R7 370)
8. Replaced the CMOS battery with a brand new one
9. Let the PC sit without a CMOS battery for 10 minutes
10. Tried 3 different PC speakers on the motherboard
11. Checked the power cables

When powering the PC on the power will come on, lights and fans come on. But the monitor receives no feed from the PC. The PC does not beep or makes any indication that it is even entertaining the thought of entering a boot sequence.

What does it mean when a PC does not even produce a POST beep code?

Any help the forum could provide would be appreciated.

Here is the motherboard manual.
https://download.gigabyte.com/FileList/Manual/mb_manual_ga-990fxa-ud3_e.pdf

 

[vov4ik_il]

Try bracketing, disconnect everything but CPU and 1 stick of RAM. Hook up the buzzer and see if it begs for GPU.