PC won't post when drives are in AHCI mode only IDE???

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Joined
21 May 2010
Posts
208
Location
London
Just a quick question and I wonder if anyone can solve this strange mystery. I completed the first part of a new build yesterday. Everything was going well and it booted up first time with no issues straight into windows which was already installed on a pre-existing drive. Used the computer for a few hours and then tried overclocking and testing different speeds etc. Got a bsod and it refused to boot up.

I got a BOOT.MGR is missing message which usually means the master boot record is corrupted so I loaded my windows disc in to do a repair etc and it wouldn't load. I found out later that it was because I hadn't changed a setting.

Did some more messing around and found out that the computer will boot perfectly fine when i selected IDE mode for the drives but refuses to boot when AHCI mode is selected.

Everytime I try I get a boot.mgr is missing message. It is not a hardware issue that I can see as I am on now typing this message from the same computer.

Spec are

i7 4790k
Maximus Formula 6
8gb ram
ATI 7950 3GB

3 Normal sata drives and one ssd. Windows is on a normal drive not the ssd.
 
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