Hi, it does make sense that the xbox starts fragging with the reader connected. The Eeprom uses the IIC protocol. This protocol uses 2 lines. The SCL (serial clock line) and SDA (serial data line). IIC is a bus. You can have several devices on the bus. To put data on the bus, devices pull the lines to gnd. If you connect the reader, it will initially pull the lines to gnd, so that no other device can put data on the bus. During startup, the PIC processor expects some information from the x86 core starting up. If it doesn't receive this information, it will shutdown and restart the power supply to force a reset that way. It will do that a couple off times and than give up. On a 1.0 and 1.1 xbox, it will give up with the power supply left on. (The blower is running) On a 1.6 xbox, it seems to turn off the power. Your fragging xbox probably had a bad contact somewhere. When you opened it to connect the reader, the contact probably restored itself for a short period giving you the time to install the softmod. That is the smartest explanation I can think of for the moment. I would like to improve the reader concept a bit. I noticed that the original hardware with the resistors and the zener diodes doesn't work on every pc. I also was wondering why people wanted to connect another supply for the eeprom in the case of a fragging xbox. I already have my answer for the 1.6 xbox version. I am also wondering why 5V zener diodes are used. In my xboxes, the eeprom supply voltage is 3V3, and according to the spec's, the voltage on SCL and SDA should not exceed the supply voltage with more than 0.6V. The important thing is that the concept works and that it is a solution for even fragging mobo's to get the Eeprom information which is vital to unlock it's harddisk. regards.