Okay, first, the answer:

Q: How do I open HQX files in Tiger, since they’ve dropped native support?

A: Open it in Safari. Not even kidding.

And the question.

Internet! Answer me!

What does it mean when, on a G4 powerbook, the green light around the power adapter is pulsing on and off?

Note: I do not remotely expect this to be a good thing.