A7v333 won't power up

I have a ASUS A7v333 MB it was working fine. I had to switch the power supply to get a different system up and running (more critical computer) I then tried to place the old power supply in my system to see if it would work. When you hit the power button everything would just barely move and then nothing. Now nothing will even move. I tried a new power supply, nothing, I've switched the original power supply back, nothing, I've clear the cmos and replaced the battery, nothing. Any ideas, or do you suppose that i've fried the cmos and how would I check this?

(^^;( You've checked it already, if you are making sure CPU and memory are good.)

If your floppy is being read yet, maybe you can flash bios automatically in autoexec.bat.

Otherwise, you would flash it on other mobo.(Very Dangerous.)

Well everything is dead, the LED powerlight is on but nothing else works. Can I flash bios from another computer or something since this is dead?

This is often the case that bios is gone.

There is such a instrument as can flash bios-rom safely, but somewhat expensive.

So that, some people make use of the mother as replacement which match the said bios-rom at least its size.

Then, make the rom (it is alive) half-plugged and boot as usual with DOS floppy. If it booted up, unplug it and exchanged it into Gone-Rom, and flash it. Very simple but of course dangerous.

Just like kdm12 I have a A7V333 Asus Slot A mobo that has worked perfectly fine till the other day when I didn't have patience to wait for it to turn off itself so I turned it off with the powerswitch.
Now when I try to start it nothing happens. No fans no nuttin.
The Onboard LED is lighted and the NIC LEDs are flashing from traffic.

Anyone has a clue as to what causes this?
- The Power button broke?
(gonna try to short the two pins 2nite)
- The PSU broke?
- The CMOS battery's dead?
- ???



I'd try the above suggestions but I can't understand what, when, who and why.