Woz has a reset button on pc not sure if hobbit has one. But same symptoms, won't power on, reset button fixes.

Black, White & Green. Hmm.....

Hardly an expert here, but I would track this loose wire back to your on/off switch. It appears to have the attributes of an AC supply connector.

Unplug your machine. Right side of the huge metal box with the boards is that connector which then feeds into the front of the big metal box with the boards. After you connect it, then plug your machine back in.

LTG : )

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My hobbits not here but is the power supply like WOZ? I had what sounds like the same thing happen on WOZ one time and this fixed it...But I think it happened from my kids turning it on and off to quickly...

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If the PC inside has no power (CPU fan does not start, etc) either (1) the PC is not receiving power (check that there is actually voltage coming into it; careful, that's line current and can kill; one hand in your back pocket ALWAYS when working on live high-power circuits), (2) the power-on pin is not connected (check the connectors coming from the power supply to the PC board -- unplugged first; never potentially hot-plug a PC motherboard!) and if (1) and (2) check out odds are the power supply itself is dead. They DO fail and the most-likely failures are infant-mortality (first 50 hours or so of use) and then a few years later, usually after the fan fails first and they cook.

Modern PC-style power supplies have an "enable" input; you can try jumping it (referenced before) but if the enable input is missing then it's not coming from the motherboard and the problem will come back again -- the board in that case likely needs to be replaced.