Km2m Combo-L - powers up - but nothing on screen

My father has just bought a new MoBo. The system powers up - and you hear the ram counting up - but there is nothing on the screen and the keyboard is also not working (apart from the small flash in the lights when the computer is turned on).
We have remembered to connect the 12V 4-Pin too - and also checked with both connecting the monitor to the onboard-VGA and to a GeForce 4-card.
I list the components we've used - I susspect after reading some of the other postings here that the weakness might be the powersupply (eventhough its brandnew and 400W) - but since I cant seem to find any precise specs on this I prefer to ask before running to the stores buying and buying a new powersupply.
But please keep an open mind and come with any suggestions you think might help.
Mobo: MSI km2m Combo-L
Processor: AMD Duron 1000
Ram: 1 x 512MB SDRAM 133
HD: 1 IBM 60GB std.
VGA-card: GeForce 4 MX440
Powersupply:
CODEGEN 400W ATX2,03
AC ind 230V AC/4A
AC out 230V AC/0,5A
+3,3V +5V +12V -5V -12V -5V SB
20A 25A 12A 0,5A 0,8A 2A
160W max. 9,6W max.
thanks in advance
Thomz

See troubleshooter by Bas up above. That is, the troubleshooter is up above.
Another possible reason is IDE settings. The HDD should be on IDE slot 1 at the end of the cable. First time I suggest no other IDE devices.
Codegen, the PSU, was in another thread compared to the infamous Qtech, which must stand for questionable technology.

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Km2m Combo-L - powers up - but nothing on screen

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