Dell Dimension 8400 Desktop wont power up

My Dell Dimension 8400 won't power up.
There is no noise, no fan, no lights - its dead.

So I changed the power unit, but when i connected it to the mains all i got was a brief light on the DVD drive, but that was it (maybe a small power surge?).
Now I cant even get that - it continues to play dead.

Any ideas?

Thanks
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