Xbox 360 0020

hi,i have an xbox 360 and it was taking ages to boot up,a good minute or two,i replaced the xclamps with the xclamp kit and there was no change, it was still taking ages to boot up and the error code was still 0022,by the way the error code from the beginning was 0022. then i heated the cpu chip up with a hair dryer and left it to cool etc and now the error code has changed to 0020 and it is booting up straight away.so i was wondering if you could help me with this problem ? any solutions or ideas would be much appreciated.thanks