SOLVED!
I fixed my dead board - here's how:
Step 1: Find a friend with the same board as you (P5Q Pro).
Step 2: Download and burn to CD the modded P5Q bios.
Step 3: Boot your friends computer and enter BIOS.
Step 4: Launch the Asus EZ Flash tool from within your friends BIOS.
Step...
May have found the cause.
Apparently ASUS update corrupts the BIOS when run under 64bit operating systems.
As I updated my BIOS with the modified one under a 64bit operating system, this may have bricked my board. A pity Asus Update software doesn't warn the user. Will investigate more.
Hey.
Tried your latest mod bios on my P5Q PRO with unfortunate results.
System restarted after bios update and failed to post. I tried your suggested CMOS clear, battery and and power out solution to no avail.
I've tried swapping sticks of RAM around etc - but system does not boot...