Mid-2010 27" iMac won't start after power failure/spike

Question

Mid-2010 27" iMac won't start after power failure/spike

Had an evening power failure, then a momentary (what appeared to be) spike, then off for a while to return about 45 minutes later. The following morning the Mac was off (dead cold) and I couldn't turn it on. I tried disconnecting the power cable, waiting 5 seconds, reconnecting, then power button, to no avail. Still dead.

Contacted Apple Chat and they said to try resetting the SMC...basically the same process that I tried previously. I followed the instructions, but nothing worked.

Anyone have insights?

iMac 27″, macOS 10.13

Posted on Aug 13, 2021 8:36 AM

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Answer 1

den.thed

Level 10

81,748 points

Aug 13, 2021 9:01 AM in response to vidfrombrampton

Did/do you have the iMac plugged into a Surge Protector?

If you do, then check the Surge Protectors reset button and/or replace it.

If not, then the spike/surge could have taken out the iMac’s power supply.

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Answer 2

Old Toad

Level 10

210,301 points

Aug 13, 2021 11:50 AM in response to vidfrombrampton

Unplug the power cord from the back of the iMac for about 10 seconds. Plug back in and try booting. It if boots but unexpectedly shuts down later on you probably have a failing power supply.

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Answer 3

Aug 13, 2021 9:14 AM in response to den.thed

Was plugged into a Woods 8-outlet surge protector, suppressed voltage rating 330V. I tried plugging the iMac it into another outlet, however no response.

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Answer 4

den.thed

Level 10

81,748 points

Aug 13, 2021 9:24 AM in response to vidfrombrampton

Also check to make sure that the power cord, is firmly plugged into the back of the iMac.

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Mid-2010 27" iMac won't start after power failure/spike

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