I have a GA-MA78GM-S2H Gigabyte motherboard that won’t Post at all (no BIOS - - nothing) just wizzing fans and nothing on the screen. No error code beeping.  It was working well for about 3 weeks and then locked up completely whilst in Windows. I had to hard reboot (by switching off the power on the PSU) and when turning it on again it did not post at all.  I have googled around a bit and there seems to be a few instances of this happening with this motherboard but no one is saying how they fixed it.  Has anyone seen this happen before? – any idea’s? 

Cheers.