If you leave it unplugged for like a week or two, chances are that most of the potentially deadly voltages will bleed off, so the caps around the optical drive should be safe.

By the way, what color is it? Since it's a 1999 model, it's either Tangerine (orange), Lime (bright green), Grape (purple/violet), Blueberry (turquoise), Strawberry (pink), or Graphite (grey).

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