So far my experience with Mac technical support has been
1. turn the power off
2. unplug everything
3. turn the power on
4. repeat, possibly holding down a key or two
or with Apple Store/Apple Repair and my last powerbook
1. Apple store says it is definitely the logic board
2. Apple replaces logic board twice
3. Apple says it is not the logic board after replacing logic board does not solve problem. It is the hard drive causing the problem and they want $900 to replace
4. Apple sends the computer back to me on my dime
Not to mention that I bought the current Macbook based on their assesment that my previous one was dead.