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How to eliminate the overscan on my Vizio VX32L?

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I first noticed that my HDTV was cutting off portions of my DVDs' picture when I watched a 1.85:1 movie and was unable to locate the thin black lines that should be at the top and bottom of the screen. A little research showed that this was the result of something called "overscan". I'm anal retentive about seeing the whole picture, so I was wondering how to disable this overscan. A person at the AVS Forum suggested accessing the service (or factory) menu for an answer, but I have only located a single site with instructions on how to do this, and their methods do not give me access to the menu. Does anyone here happen to know how to access the service menu for a Vizio VX32L, and, if so, what to adjust to eliminate overscan? I understand the controls are highly sensitive, so I don't want to change something unless I know what it does.

Thanks in advance!
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A quick Google search failed to turn up a method for gaining access to the service menu on that TV.

It appears to be one of these LCDs with a native resolution of 1366 x 768. It may be possible to plug in a PC via a DVI to HDMI adapter, set the PC to the same resolution and use a 1:1 pixel mode. You can then control the scaling from your media player, which should be more configurable than the scaling circuitry built in to the display.

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Damn it! My computer is in such an awkward position that hooking it up to the TV will be almost impossible (you'd have to see the layout of my room to understand). However, my PC doesn't seem to have a 1366x768 mode*, anyway, and I'm not sure how to adjust the PAR on my computer. I honestly don't see why it would kill them to make disabling the overscan an option on the normal user menu. I sent an e-mail to Vizio's tech support to see if they can tell me how to open the service menu. I haven't received a response, yet.

*I just did the math. Wouldn't 1365x768 be closer to the 16:9 aspect ratio of the TV? Just a little nitpick.