Part 1 of 2
The Age of this computer will Govern what newer version of macOS it will Qualify to install.
Use About this Mac from the Apple Icon on Desktop - the required Information will be there.
With the above information in-hand - follow this How to get old versions of macOS and verify what version this computer Qualifies to install. For Best results use Safari to commence the download as Others may not work.
Safari will open a redirect and open the Apple Store where the download can commence.
Does this computer appear as Listed and qualifying for an upGrade to a newer version of macOS?
The below links will help identify which version of macOS this computer may Qualify to run.
Computer Qualifying for macOS 13 Ventura
Computer Qualify for the Monterey upgrade
macOS Big Sur 11 hardware requirements
Part 2 of 2
Depending on the outcome of above as to what version this computer Qualifies to run.
Suggest the User start with Points 1 to 4 and then Test
Still having issues, move onto Steps 5 and 6 and Test Again
Still no resolve - move onto Step 7 and follow instructions therein
1 - Restart in Safe Mode. This will perform a Disk Repair, clear cache files and only load Apple Software, extensions and fonts. The boot up will be slow and can take some time - Normal.
2 - Safe Mode will also eliminate Third Party Software, extensions and drivers from loading. It will only load the Minimum amount of Core Apple Processes to allow the the computer to function at a reduced Level of Performance
3 - Does the issue present in this mode ?
4 - Sometimes a Safe Boot followed by a Normal Boot will just put things right.
5 - If not - there could be something in the main User Account playing up. To further isolate this - Set up users, guests, and groups on Mac. Then log out of the Main User account and log into the dummy account and test again if the issue persists.
6 - If the issue is present in the dummy account - then, this appears to be a System Wide issue on the computer.
7 - Download the Application Etrecheck directly from the Developer.
This is a Diagnostic Tool that makes no changes to the computer.
It makes a coherent and readable inventory of both the Hardware and Software used on the computer
The application is free or paid from added features.
The Report will Not Reveal Any Personal Information.
Post back the Full Report - copy and paste - >>>> using the Additional Text Icon ( 3rd Icon to last ) <<<<
