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I'm sorry about the issue, This usually happens if there is any problem with RAM, Hard drive or with the system files.
Please try some basic troubleshooting steps to isolate and fix the problem. First try Disk Utility :
Then reset the PRAM and NVRAM of your Mac. Follow the steps below;
The ADP000 code meaning : No issues found on your mac If you think you have a hardware issue, contact Apple or take your computer to an Apple Authorized Service Provider or Apple Retail Store to determine which service and support options are available.
Hope this help
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I believe either your hard drive is failing or the problem is with the RAMs. I had this problem before with my mac too. I got the spinning wheel when I used it for more time. And it ended up with failed hard drive and had to replace it.
So I would recommend to backup all your files as soon as possible. Then to isolate whether the problem is with the RAM or hard drive, you have to take out RAM and reinsert it. If there is nothing wrong with the RAM, then it might be the hard drive. We have already confirmed that it is not the system files. Now, we have to find out whether it is the partition or structure of the hard drive. For that, you have to erase the hard drive from Disk Utility by booting into the disc and reinstall Mac OS. Backup all your important files before erasing it.
If it still not working, then you have to take it to the Apple Store to replace the drive. Try the above steps and please let me know if you have any questions.