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I recently purchased an Acer Aspire V5-531. I replaced the 320GB HDD with a 120GB Kingston SSDNow V200 and installed Linux booting with rEFInd.

Due to a necessary change, I have to move back to Windows on this machine. However upon partitioning the drive, the system froze. After rebooting, I now get the error "Operating System not found".

I've tried using F12 (alternative boot method) and F2 (BIOS) - both return the same error.

Anyone have any ideas how I might resolve this? I've tried unplugging the BIOS battery for 30 seconds, to no effect.

Rather lost, stuck and confused!

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  • Wait, you put the original drive (with Windows on it) back into the system, then repartitioned it? When you did that you effectively deleted Windows.
    – Ex Umbris
    Commented Jan 10, 2013 at 4:58
  • I know this, however I have a Windows 8 USB key to reinstall. The problem isn't a lack of Windows - the problem is that I can't access the BIOs or boot menu. Everything redirects to the aforementioned error. Merely missing Windows isn't a problem. Also I didn't replace the original drive with the SSD. The SSD is still installed.
    – Aleaumin Fabien Dalladay
    Commented Jan 10, 2013 at 5:10
  • So the SSD is still the boot drive? Please clarify. Also, are you saying you can't even get to the BIOS configuration screen? Have you tried ESC and DEL as well as F2? Is there a BIOS prompt (i.e. "Press DEL to configure BIOS" or something similar?)
    – Ex Umbris
    Commented Jan 10, 2013 at 5:34
  • SSD is the boot drive. F2 is to access BIOS, F12 to access boot menu. Neither keys produce any output, neither does DEL or ESC. I've tried unplugging the CMOS battery to clear the BIOS, to no effect. To clarify, I can't access BIOS or boot menu.
    – Aleaumin Fabien Dalladay
    Commented Jan 10, 2013 at 5:42
  • Ouch! Something is seriously wrong, but... Check the keyboard -- make sure it's plugged in, try a different keyboard. If it's wireless, try using a wired keyboard. If it's wired and USB, plug it into a different USB port.
    – Ex Umbris
    Commented Jan 10, 2013 at 22:04

1 Answer 1

Reset to default
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You need to set BIOS to AHCI mode. Had the same problem with mine.

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    I doubt that. With AHCI or legacy mode incorret the system should find an OS and then fail. OP gets an error before that.
    – Hennes
    Commented Jul 27, 2016 at 7:49

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