Some keyboard keys don't work; most are fine

Hi guys,
I have a really bizarre problem with my first generation 15" MBP. When I turned it on today, I realized that the down and left arrows don't work, yet the up and left arrows do. Unfortunately, I've also since realized that the tab button doesn't work, nor does the space bar! It's just a few sporadic - but very important - keys that don't work. The computer hasn't been through any trauma - no drops, no water damage, no poor working conditions...this just happened out of the blue. Does anyone have any idea as to what might have caused this, and if there's anything I can do myself to fix it? Oh, and I have Windows XP installed via bootcamp, and the same problem exists there - so it's definitely a hardware issue...right?
See this link for a photo I took of the keyboard, with the buttons that no longer work highlighted in red. http://img193.imageshack.us/i/keyboardwjp.jpg/

There are two basic possible problems though your description of which keys are non-functional leads me to think the first is rather unlikely. The first is that the keyboard cable may have worked itself partially loose. The cable can work itself loose without any trauma involved - we see one every couple of months where I work. The second possibility is physical disruption/damage to the individual keys, like water damage or something small working its way under the key to impede its ability to touch the contacts. I'd suggest going to an Apple store or repair center.

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Aquitaine wrote:
Hi there,
Sending my brand new ENVY back for service (on its first day...boo) but baffled as to what might cause this.
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I'm going to ask HP to extend my warranty for a year in exchange for not simply returning it - as my first HP purchase it doesn't fill me with confidence.
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Serial Number: [Personal Information Removed]
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Some keyboard keys don't work; most are fine

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