I have a Dell Latitude CPx and recently the fan started making noise-a loud purr. I had a computer friend look at it to confirm that it was the fan and nothing else and he agreed that the noise was indeed coming from the fan. This happened once awhile back and the simple and instant solution was spraying pressurized dust remover into the fan. I've tried this several times already but this has not worked. Any advice? Also, it seems that the fan blade is a bit loose as it can move back and forth just a bit on its foundation. Help!