I have noticed an increase in the number of forum entries complaining about the quality and life of their equipment especially with the advent of Blu-ray.

Many years ago when I first bought my home in March 1976 my Hi-Fi sounded great.
I have a Mcintosh] tuner pre-amp, amp and a Star Sota turntable among other items.

But when summer came, temperatures constantly in the 100s and all the air-conditioners going full blast),I noticed my HI-Fi didn't sound as good. So I investigated the why and found my power in was not what it should be. Now you can't fight the power company and win at least not cheaply.

I have underground line power and I found out that underground line power tends not to be as high as over head line power, especially at high loads times, During June thru August and into September the temperature here in the Phoenix area is constantly in the 100s. I have seen 122.

So I bought a Line Conditioner - Automatic voltage regulation with surge protection. Good ones are not cheap, but well worth the money, hey I hope you have at least surge protectors on your equipment. Note I didn't put the power amp on it the line conditioner, but on a surge protection the mac could take care of itself.

Blurb on my model:
“Protects sensitive electronics, computer accessories and home theater equipment from power-related damage and performance problems. Extends the useful life of connected equipment by providing optimum voltage conditions for enhanced efficiency and cooler internal operating temperatures. Reliable transformer-based voltage correction circuits maintain 120V nominal output during voltage fluctuations between 89 and 147V. “

So if you have had any problems you might want to check your input voltage and total the wattage of all the equipment you need to attach to it and buy one of these. It worked for me, I have bought one for each of my viewing areas.

Me three. On all my computers and equipment. I have gradually been replacing the sawtooth wave ones with refurbished sine wave, generator friendly units as budget allows. The older units I now use in bedrooms and elsewhere to keep lamps and alarm clocks available during a power outage. Comes in handly when a thunderstorm hits in the wee hours.