I have a HP a530n running XP, seems fine except on shutdown at the end of the process start button and mouse flash with a clicking noise for 10 to20 sec. , then it shuts down, has been working this way for weeks. Should I be overly concerned?. The engine light on the car has had similar problem for the last 4 years, mechanic said put a piece of tap over it, any ideas other than find a new mechanic? and thank you for any help in advance.