Punto wont start

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Help
I have a 2003 punto 1.2 8v and it wont start there is no spark the fuel pump pulse's when priming not a constant buzz and the relay box under the bonnet has 2 red relays in one relay is also pulsing. I have changed the cam the crank and the fuel senser's and the fuel pump but still no joy any ideas would be much appreciated many thanks
Clive

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Do you get no spark at all or is there a weak spark on only two leads? I had a similar problem with my wifes punto.Changed coils leads plugs etc. Turned out to be the ECU had failed, very common problem £120 to have unit rebuilt.

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Hi
There is no spark at all on any leads also replaced relays still the same ? many thanks
Clive