Mac Pro won't start up. What's the best way to check the power supply?

Hello. I'm having a severe problem with my 2007 Mac Pro. The symptoms are very easy to describe. The computer apparently shut itself off overnight, and when I press the power button to turn it on, absolutely nothing happens. No lights, no chime, no signs of any power whatsoever in the computer. I have never had major problems with the computer before. (Although I had recently noticed some minor skipping problems with streaming videos and Firefox had started hanging occasionally.)
So far, I have checked the power cable and the power outlet. I have also reset the SMC (holding in the Power button for 5 seconds with the unit unplugged). I am unable to see any light in the diagnostic LEDs (including LED 1) when I press the DIAG_LED button on the logic board.
While I welcome other suggestions, all I can figure is that this is either a power supply problem or a major logic board failure, but I don't know which. I have a multimeter and would like to test very directly if the power supply is the problem, because they are very expensive and obviously I do not want to order a replacement supply if it would not fix the computer. Does anyone know what the best way to test the supply directly is? What pins on what cable should I test, and what voltage should I look for?
Also: No the computer is not under any warranty. If at all possible, I would like to fix this myself. Thanks for any help you can give.

Well, I may have found the answer to my question as to why replacing the fuse dows not seem to be encouraged. I cut out the failed fuse (fast fuse, ceramic, 16 Amp 250V), and replaced it with another that was as close to it in spec as I could find (15 A instead of 16). Then I put the supply back in the case.
When I tried to plug it in, I got an immediate spark, followed by an acrid smell from the power supply. Later inspection revealed that the new fuse blew, as did another component nearby (not sure what it was) where I could see blackening and the smell was concentrated. At this point, I would consider myself lucky if the power supply didn't take anything else on the computer out with it.
Lesson learned; will try a new power supply and go from there.

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