Ok, so this is a post as last resort. I read through hours and hours of tutorials and posts, and I still have a problem. Ok, I am using a v1.0 box and a X3 chip w/120G HDD. Everything installed, flashed and working after a few minor setbacks. About 2 hours after loading/playing a few games, In the middle of a game the Xbox just shut off. Now I'm not absolutely positive cuz the lights were off but I thought I saw a hint of white smoke coming out from the side, I could be wrong! Anyway the aftermath goes like this. The box frags now when I try to boot from the chip (same bank as I was using when it crapped on me), however when I unplug the chip or hold down the power button (to boot regularly) it boots to the original MS dash just fine (goes to clock screen, but I set it and works) When I try to boot the orig. bios (power and eject)...it frags. The 3v blue led comes on but no dice on the 5v. The dipswitch panel also lights up blue (X) with hdd light also when I boot the chip. I checked and resoldered connections, and d0, still the same problem. I'm relatively new to this but am learning quickly thanks to this and other greatly informative sites. But alas I still have my problem and it's driving me up a wall. Anyone please provide any insight if you've had a similar problem or have an idea to fix. I know the first reply will read "check your soldering again"...and I have, with a magnifying glass and also resoldered just to be sure, all clean and looks good. So, before I enter the infinite loop of checking my soldering, I am looking for any other troubleshooting areas that I can exhaust. Thanks in advance to anyone for thier help.