prosperoa: I'm happy to try to help you, but it would be better if you could please start a new thread. Your issue may or may not stem from the same problem as the one we've been dealing with here; either way, there's already enough here that I think it would make more sense for you to start your own thread. Please do that, let me know the URL and I'll respond there.
KemKev: thanks for posting all that output, and for going to the trouble of snapping photos of the BIOS screen. I believe you now that you've got no options! That's really terrible. I didn't know they were shipping BIOS programs that dumbed down these days. But I guess I should have assumed they were, since they know better than us what we want our computers to do.
Unfortunately, I've scoured your dmesg output and I can't see any indication of why the green light would have come on during the session with "pci=rotueirq" enabled. I was hoping there might be some clue to be pulled from this but it appears not. In any case, it looks like the IRQ issue persists as usual regardless of whether the green light is on or not.
At this point, I think I might have to admit defeat rather than continuing to make you run around in circles posting more and more output. Everything I've read suggests that you should be able to work around IRQ problems either by adding special kernel parameters or trying a different driver, but in your case it seems that nothing is helping.
Since you didn't have this problem in Ubuntu 10.10, one possible workaround would be to downgrade to the Ubuntu 10.10 kernel, where your IRQ routing should work properly. You should be able to run a 10.10 kernel in 11.04 without trouble--your 11.04 applications will all still be there (and you won't have to reinstall the system), just with a slightly older kernel running in the background. You could easily install the 10.10 kernel using the packages from http://packages.ubuntu.com/search?ke...ck§ion=all If you want to go this route and need more specific instructions, let me know.
Otherwise, the only suggestion I can make is to file a bug report on Launchpad, where you will hopefully get the attention of people more qualified to troubleshoot IRQ problems than I. Again, if you want to file a report and don't know how, just let me know.
By the way, I hate to tell you this, and I may be wrong (I'm no expert in hard drive issues), but those lines in your dmesg output that start with "ata3..." seem like they may be indicating a problem with your hard disk. You may want to check its health with smartctl (there are some instructions here), and as always, backup your important data! But again, I stress that I'm not an expert in these things and your drive may actually be perfectly fine, so don't panic just yet.