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When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
just powered up my old Mac not finding a disk to install software on.
Not knowing how your Mac was formatted, or its age, it may be that your Mac's format is too new for certain operating systems.
https://discussions.apple.com/docs/DOC-3003
If you lookup the EMC# on the foot, we can tell you what format you should have, if the drive is healthy, and if external hard drives of a certain type are supported.
Go into the Disk Utility and mount, repair, or erase the internal drive. If it doesn't show up there, it's dead or not properly connected.
(201370)
Can find a drive to install OS X on my operating system
