my issue after flashing was due to me not fully clearing the bios after the flash.
the result seems to be that some of the uguru stuff wouldn't work any longer...this included the multiplier appearing to work but not doing so in reality.
the other artifact i noticed was that a failed uguru overclock would somehow be the next boot up clock...

if a good bios clear doesn't help then maybe a reflash will
also some other setting may have been changed like your default ram timings or something.

i havn't read this whole thread but post code 25 is probably something to do with periferals like keyboard, hdd or gpu