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I had to flash the latest BIOS into a Gigabyte GA-P55-UD6, because the system didn’t recognize some more modern devices on USB. All settings are more or less standard (no overclocking, etc.). Only SATA drives are mounted, no RAID. After this I checked and updated CMOS settings and set boot order. Nevertheless when booting the system hangs with ‘Loading Operating System ...’ unless I go into boot manager (F12) and select the correct hard drive.

Obviously I've missed something, but what?

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Are you saying the boot order configuration is not being saved? – Ramhound Oct 3 '13 at 12:14
No, the boot order configuration was saved, but I've mixed up some drives with similar names. Sorry for bothering. – esc1729 Oct 3 '13 at 13:03
Post the solution as an answer and remove it from your question. – Ramhound Oct 3 '13 at 13:08

RESOLVED! I've mixed up the names of some drives when re-configuring the boot sequence. Sorry for bothering!

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