Anyone care to hazard a guess as to why an attempt to update a nightly would leave you with a phone (Samsung S2 SGH-I777) that will no longer enter into recovery mode? Once a nightly downloads, it offers to reboot your phone, and install it. When I did, the reboot just went to a black screen (detailed in postings above). Reboot, battery removal and reboot, over and over before finally starting up normally, with the nightly not installed. Download the latest nightly, and same scenario. Decided that independent of trying to install a nightly, I would just manually trigger recovery. Same problem, yellow triangle as it starts, slight flash of white around the perimeter of the screen, then black. The phone is sort of on in that touching the screen will illuminate the keys, but it is stuck. You can reboot, you can pull the battery and reboot, over and over and it comes up in this weird mode before it finally, for reasons unknown, will boot on up in to normal working mode. Since I cannot flash any fixes, I grabbed ROM Manager off of Google Play, which allows you to install the latest Clockwork Recovery. Update was confirmed, and it offered to launch into recovery. Same black screen. Trying TWRP mode results in the same black screen. Pretty much screwed as you can't get to factory reset, or flash anything, without recovery. I can get to download mode, so pondering what actions to take with that.