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I've got something strange going on here. I have a a laptop which could reboot because the BIOS was set to start-up from network. I changed the booting order to the internal HD to be the first, but for some reason, the laptop still wouldn't boot.

So I took out the hard drive, installed in into an other laptop and installed a fresh copy of Windows 7 onto the hard drive. Everything went well and I've got a working copy of Windows 7 installed on the hard drive of the first laptop.
But, when I switched hard drives again (the hard drive with the fresh Windows 7 goes back into the broken laptop), I get the message "Operating System not found...", even though the hard drive does work without any issue in an other laptop...
Even when I insert the Windows Disk and tell the BIOS only to run from the DVD-Drive, I get the "Operating System not found" error...

What could be the cause of this strange behavior? And how can I solve this?
Is it possible the laptop hardware doesn't support Windows 7 and by so giving this error message?

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It's more likely that the hard drive isn't being detected by the laptop. –  user3463 Aug 13 '12 at 8:02
    
That's what I thought. But the BIOS is detecting the hard drive (I guess). How does this come and how can I solve this? Or is this a motherboard failure? –  Michiel Aug 13 '12 at 8:08
    
Very hard to say from this side of the screen. Perhaps a local tech shop will be able to diagnose it for you. –  user3463 Aug 13 '12 at 8:09
    
I understand... Is there anything I can provide you with so you get a better view on the situation? –  Michiel Aug 13 '12 at 8:21
    
Nope. I think it's a physical problem, so I'd want to play with it to get an idea. Sorry :-( –  user3463 Aug 13 '12 at 8:24
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