I installed a Crucial M4 into an older computer with Asus P5Q. After installing Win7 I went to motherboard BIOS and changed SATA mode to AHCI to get better performance (even if to be honest the system was super-fast in IDE mode). After I saved the new setting and exit, the m/b won't POST - I can't even go into BIOS setup again to change it back... Please help me, is there any way I could at least get access to BIOS setup to change it back? there isn't any beep code, the screen is black and system is quiet