You could use Everst to see if SLIC is present and the OEM id/OEM table id of the RSDT table is alright.
Also tested bios1103 no problem so far, up ur ram voltage abit previous 0803 bios ram voltage was overvolting by 0.08v thanks Fzeven
Biostar P4M900-M4 6.x SLIC table and RSDT are correct. I guess this one just won't activate. Thanks for your help
Fzeven theres some problem with P5Q deluxe 1103 bios, bsod on boot if overclocked, i have tried the original bios same problem nothing to do with ur mod.