So about 5 years ago, I got my Xbox 360 set up with a DemoN dual NAND. However, I was just learning to solder at the time so I sent it in instead of doing it myself. When I got it, it seemed a little slow booting at first/would need to be unplugged and then plugged back in before powering up again. I thought this was just related to imperfections in the methods as they were relatively new at the time. However, I just plugged it in again today (after probably 3-ish years of not using the DemoN NAND) and decided it was time to back up some games, as I lost a few somewhere while moving. The first boot worked flawlessly in a matter of seconds. At shut down, it wouldn't turn on, just beep, so I plugged it in again and it worked. After the second time, it won't turn on any more, only play the sound effect when the power or eject buttons are touched. The weird thing is that my Stock NAND works perfectly, so I'm assuming this would be a bad flash/a wire might be loose. It is, I believe, a Corona built in 10/2012. I think the guy used a Coolrunner Rev C, but I am not sure. I do have backups of my CPU, DVD, and Fuse keys/codes in case those would be useful. Thanks for any help/questions!