You can try If you have acces to a compatible board. Do not flash the modded one but flash a original.
Did you import the certificate. Did you used a slp2.0 key. Is the SLIC present. ( you can look with Everest )
This is what I did : HP.xrm-ms installed via SLMGR 932CC key used (OEM) SLIC Present in everest 27 days in vista life
Can you make a dump of the slic table with acpiscope & upload. You can try some other keys, sometimes it helps.
ok, i'll try other keys, maybe it's due to half SLIC problem (i saw this in one thread somewhere here), send you dump file soon thank you very much