The machine switches on but no data on the screen. The screen backlight keeps flashing on and off.

Try to flash, and send the result...

Thank you. I programmed with your dump and now the display goes dark black when the machine switches on, tried the hdmi output but still no display data can be seen. Will try see if there is something wrong. The machine is brand new dead out of the box.

And test the dump:

The first dump you provided has now worked well. Thank you. Only thing it has svp.

It has what?

Supervisor password. Am unable to enter the bios setup.

The dump above assembled from your backup (first half, PCH Region) and working second half (Bios Region) from here.
If SVP existed, it was in your PCH Region.
You will try to flash the next official dump:

But, I think, it will no effect...
I think, SVP stored at EEPROM of special controller or HUB, and will replicate in BIOS flash at first start.
See here...

for what is jme1 pins reset?