It sounds to me like you failed to properly seat the processor chip in the socket. I had a similar event while testing removable processor cards in some PM 7300 machines. Once I checked the card and FIRMLY pushed it in properly, the chime returned and it booted just like it was supposed to. As to the problem of not shutting down by the power button, just go ahead and pull the power cord from the machine or the wall (whichever is closer to hand). That won't hurt the machine at all since you are not actually running any program and have files active that might be lost. After checking the card for proper seating, hit the power button again to start up. If it still doesn't start up, you have another problem that might need to be seen at a shop. If it starts up, run Apple System Profiler to check the performance of the new processor card.