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My friend's computer switched off suddenly and since then nothing happens when you press the power button - no spinup, fans or anything. The only sign of life is that the motherboard LED is on. Is this a motherboard or a PSU issue? We can't find any blown capacitors.

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The model of motherboard would be helpful. Is the light labeled? Some boards have lights to indicate that there's any power, some have lights that indicate there's good power. –  EKW Mar 8 '12 at 7:14
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It's impossible to tell without testing. Short the trigger pins on the PSU to see if it starts up, and try a fresh PSU with the motherboard as well.

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