Motherboard GA-2FA78M-HD2
CPU AMD Phenon AD860KXBJ
Graphics GT710
RAM 2 x 4Gb unbuffered
User built PC was working fine. Changed front panel and problems start.
No boot no video no motherboard ledn

Have power to cpu (fan at least),Main fans work and light, usb ports illuminate
Tried:
Check all connections
Only drives connected ( 3 SATA)
Only 1 drive connected
Add keyboard
Add mouse ( has power )
Dropped it ( just kidding )
HDMI (3 different cables ( but as working before should be OK
VGA - HDMI cable
No change in activities.
Only other access to internet is ancient netbook so unable to swap components and I am at a complete loss as to next step.
If anyone has any ideas I will be forever gratefull.
Keith
ps. I know asked before but different spec so asked again to keep separate