strange behavior

[Shadow-R]

Terve!

At the moment I do use a system that is going to a friend at the beginning of next year.

Because I like tweaking and some games do have problems to run, I overclocked the system.

Due to performance restrictions I was focussing on the CPU.

Well, since I overclocked the system at every first startup a day there is the message: "reboot and select proper boot device or insert boot media in selected boot device and press a key" dispayed.

I cannot skip it by pressing a button, but I can use CTRL+ALT+delete to restart the system. Then it works fine.

As soon as I use the not OCed profile this message disappears. I already checked for the boot settings - they are exactly the same.

Where should I look for a solution?

It is not really an armaggedon though. But anyways I am very curious what on earth could do that with me.

The system has an:

AMD A10 7850k APU

a gygabite GA F2A88XN Mainboard

a 2x4 GB Vorsair value select kit (that is also overclocked)

and it has a good old 1TB HD, as far as I remember by Seagate

And some other components, I do not think that are worth posting.

It is running of a Windows 7 64 bit OS

P.S. The system has of course passed a multiple hour stress test and runs stable in games and daily use.

Thanks already for the help.