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Sometimes won't power on, only has black screen & power light
Hi! I've got a 15" aluminum Pro that is not behaving. Typically when powered on, the optical makes its startup noise, the screen stays black, and the sleep light glows. The chime noise does NOT sound. Occasionally when I try various things such as reseating/changing the RAM, pulling the battery, etc., I'm able to get it to power on, screen and chime and all, and to act perfectly. When it does this it stays working for most of a day, but just when I think it's "fixed", it goes back to black screen/glowing sleep light mode. I've ruled out AC, battery, memory, and the memory slots.
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