I called the electrict utility and they came out and did something (?). At leat they are monitoring the voltage. Whether it was because of something they did or not, the voltage returned to normal levels and my Monster Power Center is now properly passing electricity to the rack components.
However, since my home theater system began working again, I've noticed a couple of troubling issues from my Sony STRDA5300ES receiver (at least, I'm assuming the problems are associated with the receiver). First, the video output no longer fits the tv screen. I've tried all of the screen adjustments (Full, Normal, Zoom, and Wide Zoom) available with the tv (a Sony XBR4) but none of them seem to correctly display the video image (Zoom comes the closest but it is cutting of the edges of the video stream. Making the minor adjustments offered in the tv menu - normal, -1 and -2 doesn't solve it). I've also looked at the DVR, but I can't see any adjustments to be made other than resolution, which is set at 1080i (which is what it was before the power surge).
More troubling is that the receiver doesn't seem to switch between video sources, although audio sources are properly switching. For example, I switch to computer input and the computer screen will not display on the tv screen. However, the computer audio is piped through the surround-sound speakers.
Is it possible that I could have inadvertently changed some settings or are these signs of something wrong with the receiver, possibly due to a power surge?