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iMac (24-inch Mid 2007) Take Apart — Symptom Charts 212
Power Issues
No Power
The computer will not turn on. The display remains black and there are no sounds from the fans
or drives.
1. Verify the power outlet is good. Plug a dierent device into the socket to ensure there is power,
or plug the iMac into another outlet. Does the iMac power on now?
Yes: Resolved. Bad outlet.
No: Go on to the next step.
2. Check the power cord. Use a known good power cord. Does the iMac power on now?
Yes: Your power cord has failed. Replace the AC power cord.
No: Go on to the next step.
3. Check the connection of the power cord on both ends. Verify that the power cord is securely
plugged into both the AC outlet and back of the computer. Does the iMac power on now?
Yes: You may have a loose t to your power cord. Replace the AC power cord and test.
No: Go on to the next step.
4. Follow instructions in the General Information chapter to reset the SMC. Does the iMac power
on now?
Yes: Issue resolved.
No: Go on to the next step.
5. Remove and reinstall the SO-DIMM memory modules, located in the bottom of the computer.
Does the iMac power on now?
Yes: Issue resolved.
No: Go on to the next step.
6. Remove the memory access door and front bezel to gain access to the four diagnostic LEDs.
See “Diagnostic LEDs” in the General Information chapter for complete instructions on this
procedure.
7. Plug the power cord into the iMac and the power cord into the AC outlet. Check to see if LED
#1 is On or O.
LED #1 is On: This indicates that the power supply is getting good power from the AC outlet.
Go on to the next step.
LED #1 is O: This indicates that the computer is not detecting AC power. If both the AC
outlet and the power cord are good, replace the AC/DC power supply. If the issue persists,
replace the AC line lter.