Abit kV7 problem.

[Kejon1]

I realized this would be the best way to get a fresh response.
For this computer, I had some of the parts for almost a year now but I have now built this system.

CPU: Athlon XP 3000+
M/B: ABIT KV7 with onboard sound and LAN.
RAM: 1 X 512mb PC3200
HDD: WD 250GB, 7200RPM
GFX: NVIDIA GEFORCE FX 5500 256MB AGP 4X/8X
PSU: 480w branded
DVD R/RW/ROM: Nec 3550A
CDD: LiteOn 52X CDR/RW

problem? it won't post. i press the power button, and all I get is a click from the PSU and i tiiiny motion from the CPU fan. nothing else. ive tested the PSU elsewhere, also the CPU and the GFX card. all work perfectly fine on another system. the mem is new and the HDD is new. and the CD Drives have been tested on other computers and have worked fine.
please give me some good news about my mobo. please

[dodgybob]

Tried a cmos reset?

[Kejon1]

affirmative. no booty

[BUFF]

tried an out of the case install?
What exact PSU is it?

[Kejon1]

yes i did. ive got two both of which worked perfectly well on another system. they are

EVA EB-350P and

Colorsit PSCI-480P