Help diagnose this hardware problem please!

Hi all.

My old PC started playing up two weeks ago after we had a storm and the house electrics got knocked out - it could have been a power surge.
Basically when I start the PC nothing shows up on the monitor, the keyboard lights don't come on and the cd drive doesn't open.

I immediately suspected it was the PSU and just replaced it with a new one but it hasn't fixed it. The PSU was fairly old so it needed replacing anyway but I felt sure it was the problem.

What else could be causing this?
I'm now suspecting the motherboard but don't really want to go and buy one until I am pretty damn sure.

The PC specs;
Pentium 4 (S478) 2.6Ghz Northwood CPU
Asus P4P800SE motherboard
Corsair 1GB PC3200 RAM
Corsair 400W PSU (new one)
Maxtor 120GB HDD

Any help would be appreciated.
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More about help diagnose hardware problem please
  1. Disconnect from mobo and any other devices , unscrew your PSU out of case, connect it to something like an ODD or case fan and try jump starting it?
    http://www.overclock.net/faqs/96712-how-jump-start-power-supply-psu.html
    Shot the green and black wires with the paper clip
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