new mobo that you left a hex standoff there that didn't line up with a mounting hole of the new mobo. That is frequently done and shorts some artwork circuitry, sometimes irrepably damaging it, others just prevent it from running.
The next test is to mount the mobo on a large piece of cardboard, isolated from everything.
As for turning off with the switch, it may require holding the power button depressed for 5 seconds.
I took the motherboard and processor out of a working pc to repair another pc. To repair the pc I robbed I purchased
ABIT SG-72 v1.1 motherboard
Intel P4 3G 800 mhz
512MB 3200 DDR (Bravo)
new mb has onboard ethernet, sound and video
PC was running WinXP pro w sp2 but that is not material as bios does not load.
When I power on computer the power supply fan (PowerMax ATX switching 400 watt), cpu fan and case fan all come on and stay on. No power led, nothing else. I get no beeps. I have rechecked all connections - now all drives are unplugged, the only things plugged in to motherboard is cpu with heatsink/fan, memory, case fan, leads to case speaker, pwr led, hdd led, reset, pwr sw. Switch will turn power on but not off and no leds light. What have I done wrong?????? Thanks