Cool ; )

What's 80x25? Seems like it's not present in the manual.
Ok, that's text mode res ; ) So what does POST indicator say?
@70~77,D2 Late South Bridge Initialization
92~96,B5,D4 PCI bus Initialization@

Display should be attached to GPU in PCI_E2.
CPU PCI-E Lane Configuration -> dunno, but lowest possible, Gen1
PEGX - Gen X-> Gen1
PCI Latency Timer -> play with it
Initiate Graphic Adapter -> PEG
IGD Multi-Monitor -> Disabled
Integrated Graphics Share Memory -> dunno.. 32M
Integrated GPU should be disabled anyway, tho I can't see BIOS option to do it.
Intel(R) Rapid Start Technology -> Disabled
Internal GOP Configuration -> What's that?
Full Screen Logo Display -> Enabled
Boot Mode Select -> try both

Also try shorting PCI-e presence on all risers.
And maybe different BIOS versions.
RAM - try more/less/different.

https://bitcointalk.org/index.php?topic=1661923.0
https://bitcointalk.org/index.php?topic=1640050.0