Greetings,
While I'm sure the problem or behavior you are experiencing is obvious to you, what you are describing is a bit vague.
"After the last issue".. Which was what?
Am I following correctly?
You have a system that powers on but does not POST?
You've replace the power supply and CPU, but the "No POST" situation persists?
"Board wasn't used for two years"... Did it ever work?
Troubleshooting:
Great you have replaced the PSU and CPU.
Other options.
-Perform a close inspection of the board
Circuitry, capacitors
CPU and socket
Memory modules and slots
Verify all connections
Reseat all cards
Perform a CMOS Reset
Try booting with only one memory module installed
Be willing to bench test the board (outside the case)
You need to perform more troubeshooting and decrease the number of potential problem areas or variables.
If none of this helps. try bench testing. That failing, and if no damage exists, the board is not worth much, you can RMA and see what Support finds.
Board has a 3 yr warranty. You'll need proof of purchase (date):
http://rma.gigabyte.us/