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Thanks for the answers so far. Don't think it was a power surge as have a surge protector and no lightening. Also, my other comuters were all ok.
Don't get anything when I press the power button - no fan, no lights, nothing on the monitor. Completely dead. If it's a mother board or power unit, is this easily fixed and what sort of price? I.e could i buy these myself and fit them or would i have to take it in somewhere? Which would be best to investigate first? I'm not scared of fiddling with the innards of the thing. Just need some directio as to the possible cause.