Screen shows circle with diagonal line

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Trying to fire up an old MPB.
I get the chime sound but the screen shows a circle with a diagonal line running north-east to south-west.
Comments appreciated.
M
 
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"A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.

  1. Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
  2. Turn on your Mac and immediately press and hold both Command (⌘) and R to start up from macOS Recovery.
  3. While in macOS Recovery, use Disk Utility to repair your startup disk.
  4. If Disk Utility found no errors or repaired all errors, reinstall macOS."
 
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M
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Thanks very much, Randy.
The Mac restarted in recovery just fine.
In fact, I was just about to erase an old Lacie (spinner) HD.
And then totally erase the HD on the MPB itself.
I'll press on with these tasks when I'm in a position to monitor what's going on.
Your help is much appreciated.
M
 


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