iMac (21.5-inch, Late 2012, Early 2013, Late 2013) and iMac (27-inch, Late 2012, Late 2013): No Power
Unlikely causes:
Camera, camera/microphone/ALS cable, CPU fan, DisplayPort cable, hard disk drive (HDD), HDD data cable, HDD power cable, LCD panel with glass, left speaker, memory, right speaker, solid state drive (SSD)/Flash storage card, stand, WiFi/Bluetooth antenna(s), wireless card
Quick Check
| Symptoms | Quick Check |
|---|---|
| Computer does not power on No image on internal or external displays No startup sound No sounds from fan or hard drive (if hard drive present) No Caps Lock LED when key is pressed on wired keyboard Non-operational Note: Inform user that computer failures due to accidental damage are not covered. If applicable, discuss out-of- warranty repair options. | Verify AC power source. 1. Disconnect all peripherals. 2. Verify user's power cord. 3. Determine whether computer is in power-on state by 4. checking for all of the following: Caps Lock LED on wired keyboard Fan spinning sound Startup sound Hard drive spin (if hard drive present) Display backlight on or flash External display activity Thunderbolt disk mode operation Reset SMC using the procedure listed for this computer 5. in Apple Support article HT3964: Intel-based Macs: Resetting the System Management Controller (SMC) to reset computer to a known power-off state. Try to power on from power-off state. |
Table Caption: This table outlines troubleshooting steps for a computer that won't power on, providing a quick check to diagnose the issue and suggesting a specific SMC reset procedure.
Deep Dive
| Check | Result | Action | Code | Commodity | |
|---|---|---|---|---|---|
| 1. | Attempt normal startup. Press power button to start up computer. | Yes | Go to step 14. | ||
| Check computer for any signs of power activity, such as fan or hard drive activity (if hard drive present), startup sound, or Caps Lock LED on wired keyboard. | No | Go to step 2. | |||
| Inspect user's power cord for wire or connector damage. Also inspect | Yes | Go to step 3. | |||
| 2. | computer AC inlet for signs of arcing or damaged pins, which could affect power cord connections. | No | Go to step 4. | ||
| Did you find any damaged components? |
Table Caption: This table outlines a troubleshooting process for a computer that is not powering on, guiding the user through checks for power activity and physical component damage.
Table Caption: This table outlines troubleshooting steps for power-related issues with a computer, detailing checks, their results, required actions, and associated codes and commodity types.
Table Caption: This table outlines troubleshooting steps for a computer repair, detailing checks, expected results (Yes/No), required actions, and associated codes and commodities.
Table Caption: This table outlines a troubleshooting process for a computer issue, with steps to check diagnostic LEDs, power supply, and the power button. Each step includes conditions for "Yes" or "No" results, leading to specific actions, codes, and commodity information.
**Table Caption: This table
