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I have 5 hard disks built in my computer, two connected by IDE cables, three by SATA. Today I had to return two of the SATA cables to my room mate. So I grabbed another one I had floating around and connected the remaining disk by unplugging my DVD R/W. Now I receive the 'insert system disk and press enter' error after booting. Disks and cables seem to be fine, since all the disks are recognized in the BIOS. Also, I can mount the disks using a live CD w/o problems. I also tried different orderings of the cables (i.e. plugging the disks in different plugs on the mainboard), I'm not sure if that even matters using SATA. Any Ideas what might be the problem here? The OS installed are Windows 7 and Ubuntu 10, the bootloader installed is GRUB.

PS: No RAID involved, JBOD.

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I've no idea why, but in my desperation i reinstalled GRUB and everything works fine again. Sorry if I wasted anyones time.

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Did you check the order that your HDDs are booting from? If the HDD with the bootloader is not the first one in the boot order, you will see this error.

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Do you mean the BIOS boot order? There, i can only select HDD in general. If you meant the First/Second/Third... SATA master ordering: Instead of all the three disks I connected only a single one, and tried that with all three disks (since I was not sure which physical disk my bootloader is on), still, no luck. – Matthias May 27 '10 at 22:12

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