Why won't my iMac display anything?
The iMac turns on, plays the boot chime, and shows the normal white screen. After 1-2 seconds, the screen becomes black but it continues booting.
I would try the onboard diagnostics to see if that loads. Restart the system and using a USB keyboard press the D key to enter, run the diagnostics and let us know of any errors.
have you tried connecting to a monitor or tv to see if it will display anything on the monitor or tv?
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