Computer Nerd Kev  wrote:
>
> If the 9V fuse in the computer hasn't blown, you might try removing it
> and connecting your multimeter in its highest current measureing range
> across the fuse terminals. With the computer breifly switched on, you
> may observe the current above or near the 1A maximum rating which would
> indicate a short or component failure. This test should be breif, as the
> excessive load does risk overheating the transformer in the power
> supply.

Actually you should first test for a short with your multimeter. Check
that there is no short (near 0 ohm resistance in lowest multimeter range)
between these connections at the User Port:

User Port Pin 11 (-9VAC) - User Port Pin 10 (+9VAC)
User Port Pin 11 (-9VAC) - User Port Pin 1 (GND)
User Port Pin 10 (+9VAC) - User Port Pin 1 (GND)

And just in case, maybe also check that it isn't shorting to 5VDC:
User Port Pin 11 (-9VAC) - User Port Pin 2 (5VDC)
User Port Pin 10 (+9VAC) - User Port Pin 2 (5VDC)

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