@MZWebb
I definitely understand your frustration, sincerely, I do. You listed one key symptom, though: the blinking Caps/Num Lock lights.
What type of blink pattern are you seeing there?
Examples:
1-blink (Blink, Pause, Blink, Pause repeatedly)
2-blink (Blink, Blink, Pause, Blink, Blink, Pause repeatedly)
And so on for 1, 2, 3, 4, 5, or 6 blinks.
Here is a chart describing the Blink Pattern Codes and their meanings. Let me know which pattern you're experiencing and we will go from there. It could hopefully be as simple as reseating a component, but it may be a major hardware issue that would require major component replacement. I just want you to be aware of the range of possibilities.
The fact that the AC Adapter light is solid white means your AC Adapter is good. It won't be necessary to replace it.