To prevent an external hard drive not showing up on Mac turning into an all-out disaster, always backup files on your system hard drive and in the cloud. Anytime you use an external drive, unmount the disk properly and store it safely.
And finally, use CleanMyMac to uninstall apps and run regular Maintenance on your system to prevent applications conflicting with hard drive performance. Ivan Exploring latest tech trends.
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5 Best Ways to Recover a Failed Internal Mac Hard Drive
So, boot from something else and run Disk Utility from there. As chscag said, you sawed off the limb you were sitting on.
You need another limb to sit on. How do I boot from something else and what else do I use to boot. You need to have an external hard drive with clone of the operating system which would be bootable. For that model this is OS X.
This is why thew first part of my signature concerning the original discs is so vital. Harry pretty well covered it.
One other option, if you have access to a Mac that works, is to download the macOS installer for your machine from Apple, then use DiskmakerX to create a bootable USB thumb drive 8GB or more is required and then boot from that on the iMac and install the OS from there. One of the features of the installer is that it also has Disk Utility, so you can partition and format the internal drive once booted from the USB thumb drive.
If I take a Macbook, hook up a hard drive and make a time machine, can I use that? What do I do? Wow I forgot I posted this It actually was my Sata cable. I replaced that and everything works fine. Thank you though Since you have access to internet, read this instructions how to solve your problem. If not, then follow the instructions below: Resolve startup issues and perform disk maintenance with Disk Utility and fsck http: Sign up or log in Sign up using Google.
How to fix Macintosh HD not mounted in High Sierra/Disk Utility?