Symptoms
Windows virtual machine was working before but now shows No boot device is available when booting up.
![](https://kb.parallels.com/Attachments/kcs-22233/Screenshot_20_censored.jpg)
Cause
Virtual machine configuration file not being read correctly.
Resolution
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Shutdown the Windows virtual machine.
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Open the virtual machine hard disk configuration: go to menu bar at the top > Actions > Configure > Hardware tab > Hard Disk 1.
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In Source drop-down menu choose Disconnected option.
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Close the Configuration menu and quit Parallels Desktop.
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Launch Parallels Desktop and access the virtual machine hard disk configuration menu once again.
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Select the source and navigate to the .hdd file located in the .pvm bundle.
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You should now see your virtual hard drive file listed in Source drop-down menu:
- Close the Configuration menu and start the windows Windows virtual machine.
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