Mac halts after boot and restarts
My mac 2012 had black screen and fan yesterday. Then I powered off it and retried. This time it has loaded Catalina desktop and a few seconds later restarted.
Now when I ry to power on either it shows black screen with fan sound or it desktop, restarts.
I did NVRAM PRAM reset.
I tried pressing D on keyboard to diagnostics but it did not load diagnostics.
I tried recovery mode. It entered recovery mode but when in language selection halted and restarted.
I plan to unmount, then try unplug and plug some cables inside.
I appreciate any idea or suggestion.
Thank you very much.
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