I was attempting to boot off of a E-SATA portable hard drive, so I set the BIOS ro AHCI, this is the version ACPI BIOS Revision 1207 Asus Maximus Formula. It never detected drive but now when I turn the system on, it tries to auto-detect AHCI port and then it simply freezes. When I press the del key it says its enetering setup but then goes no where. I've tried reconnecting and disconnecting the E-SATA drive but the system still freezes as soon as it boots up. All the internal drives are connected. If I press ALT+F2 I can flash the BIOS but I may not be able to get back into Windows 7 or XP. There is a cmos button I can press on the back of the motherboard would that do anything different.
Thanks for the help but I solved the problem. I simply disconnected all the internal drives which were ATA, then I turned on the comp and I was able to get into the BIOS and configure the SATA back to IDE. When I rebooted I was able to get back into windows.
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