Mac won't boot up using Bootcamp after trying to resize partitions my son is working on a 2012 Macbook Pro - 2.5Ghz Intwl Core i5 and running OS X El Capitan version 10.11.6. The machine was split into two partitions and windows bootcamp was loaded. My son told me that every time he tried to save a document on the windows side he got error message about no available disk space. I tried to resize the windows disk partition and when we tried to start-up again, bootcamp would not load (error saying no bootable device). 

I have read through as many similar questions and answers as I can but am not able to solve the problem. REALLY want to avoid paying to have the windows reloaded. Any way someone in the know could help me?

Thanks KD
Your Windows installation is probably permanently ruined.

Disk Utility can't resize NTFS partitions correctly. When it tries to, it corrupts some of the data inside. Unfortunately, Windows may not be able to boot anymore.

What you can do, however, is try to mount the partition (usually labeled BOOTCAMP) in macOS and copy whatever important files you have there onto a backup drive or other external/internal storage.

Sorry to say, but Windows may not boot ever again.

I once made this exact mistake and had to reinstall Windows completely.