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New Build -- System Won't Boot

When I connect the power supply to an outlet, the mobo's power led lights up, but when I press the case power button, nothing happens. I have disassembled/re-assembled 3 times; everything is plugged in correctly, but nothing other than the mobo powers up. Here's where it gets a little weird -- with mobo removed from case but with all drives, peripherals, & case switches still connected, the system boots up & runs fine. What am I missing?

ASUS P4S800D-X
Intel P4 3.0E Prescott
Antec Nine Hundred Case
Antec SmartPower 2.0 PSU
ATI Radeon

Thanks for your help.

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My suggestion.

In reply to: New Build -- System Won't Boot

Check all metal standoff and make sure they are located where it is suppose to be (and not on the wrong hole).

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No Boot Problem Resolved!

In reply to: My suggestion.

Removed the mobo & checked the standoff posts. There's nine (9), one for each mounting hole in the board; no extras. Board is secured to each post.

In an ASUS mobo forum, a user suggested using nonconductive washers to insulate board from standoff posts. I found some small fiber washers & used a photo glue stick to attach them to the tops of the standoff posts or to the back of the board.

Reconnected everything, punched the power button, and bingo -- we're up & running, raid 0 setup, & winxp pro installed. Life is good.

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