WII shuts down when power or eject is pressed

I dont think it is the chip,I have the same problem with a 3 month old UNchipped version

Depending on the chip and who installed it, it is probably shorting out something in your system. Even if the system was working before, it might have shifted or come loose. If it is only shorting your power switch then it would just be a simple adjustment of the chip. However, the chip could have shorted out your main board and when the system powers on, it detects the short and shuts itself off as a fail-safe. Removing the chip *might* fix it if it didn't totally fry the system.