The best part of a month ago I decided it was time to try adding some extra chips to my motherbord. I had a spare 1.0 board which apparently had a busted video chip on it, so I used that as the donor.
Underestimating the difficulty of the operation and the fragility of the chips, I did a rush job and broke a few pins off. Since I was in it more for something to do then for the results, I attempted to add the chips to my 1.1 board anyway (draping solder over the gaps)... Long story short, I ended up removing the new chips and was left with a whole lot of wrecked traces and a FRAO console.
Lessons learnt, I removed the original chips from my 1.1 board (slowly this time, with no breaks) while waiting for a cheap X-Box to turn up on eBay. That turned up yesterday, another 1.0 model (I think - came with a Phillips drive, though the case claims it was made 17/01/2002. The box had been opened before I got it).
After making sure the thing worked it was off with the case and on to the chopping block. I soldered over the points for the BIOS flash, added the spare chips, wired my first controller port's yellow wire to the front buttons (for a controller on/off switch) and attempted to added a VGA socket (I'd been reading plenty of guides while waiting for the mailman).
Re-assembled, removed the VGA socket as my planned location was covered by the motherboard fan connector (something my 1.1 box didn't have) and turned it on. FRAO again, but after a bit of work with the soldering iron and a needle I finally got that green light to stay on at about 1am this morning...
My problem now is this: I get the green light, but nothing else. No video, no audio. Sounds like a coma box (and seeing as I'd soldered the relevant points BIOS corruption might be an option) only the DVD drive ejects as soon as I press the button. I tried this guide
anyway but it didn't make any differences.
If I unplug the A/V pack, I get FOAG. Plug in back in again and the light returns to solid green. The cable and TV are fine.
I can't see anything online suggesting that faulty RAM would cause this, though I did find a mention that a retail BIOS won't work if you add extra chips. But that note said the result would be a FRAO, and although no one's specifically said the statement is wrong a lot of people have at least questioned it.
At this point it looks like my efforts around the A/V connector are to blame. I've already been over the area with a fine toothed comb, a multimeter, and the remains of my soldering wick - but I can't see anything out of the ordinary. Wobbling the socket around doesn't do anything.
My problem now is I don't really know what to check. I can't see any guides as to what I should be looking for with these particular symptoms... I know it doesn't help that I've done so much to the system, but does anyone have any idea what components are relevant here?