DoctorDan wrote:The first thing that comes to mind is "did you wait for the 'verified' message in fpgaconf.exe"?
Second, did you make sure that the COM port was the correct one?
Thirdly, did you select the right board from FPGAconf.exe's menu? It needs to be the Pluto-IIx, of course.
Fourthly, be sure you're using the right .bit file. It needs to be the file named gcvideo-dvi-p2xh-gc-2.3.bit.
Finally, make sure all your wires are still connected and not grounding out or shorting.
I have my copy of Four Swords playing right now through my newly upgraded Pluto-IIx in the background, and one of the things that pissed me off and wasted a lot of time was trying to cheat with wire routing. Learn from my mistakes - make sure you:
1) Don't route wire around the edges of the GC's PCB. No matter how clever you think you are, take the time to route the wires properly through available holes. Otherwise, you will wind up pinning a wire between an RF shield and the board hard enough to cause that line to ground out. Hilarity will not ensue - I had problems for more than an hour before I realized that the controller wire was being pinched hard enough to ground it out, which disabled all input. Frustrating!
2) Don't route the 54MHz clock wire near any of the other wires. I know it makes this distinction in the install guide, but it really does make a huge difference.
3) Don't tighten everything down until you have tested everything. Yeah, running back and forth between my workbench and my HDTV wasn't fun, but you know what was even less fun? Unscrewing everything just to find that a loose wire was the cause of everything because I assumed I was doing things perfectly.
4) Do measure everything five times before doing anything once. This is something I did well in the beginning of the install - I tapped the holes on the Pluto-IIx and used offset stands from my many computer installs and nuts to create a solid mounting base on the top RF shield, but then I tried to skimp out on the wiring job. I eventually had to desolder all the wires from the board, and one-by-one gently pull them through a hole I drilled in the shield, trim, and resolder them because I didn't bother with keeping the wires short, and I was getting weird video artifacts.
I actually drilled a hole in the GC mainboard to route the wires through, I found a large section of ground plane near the digital out port with no components on either side, and drilled right through. I also have the 54MHz clock running right alongside the other wires, and have no issues with flickering pixels or anything.