Turn it on and immediately press and hold the (for Intel) or hold the Power button until "Loading startup options" appears (for Apple Silicon).
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The tool will run and give you a reference code. If it says "No issues found," you're in the clear. Turn it on and immediately press and hold
iMacs are "all-in-one" units, so a dead port usually means a dead motherboard. buying used imac tips
Run your fingernail along the edges of the glass to feel for small cracks.