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USB Refuses to Work Past EFI After CPU and SSD Upgrade

unanswered iMac Intel 27" EMC 2546 0 Answers

DanJ 502.2k

Commented

2 days agoAug 26, 2026

commented 2 days agoAug 26, 2026 by DanJ

0 Answers

iMac won't start. Late 2012 27" 3.4 i7

unanswered iMac Intel 27" EMC 2546 0 Answers

George Tedrick 13

Asked

Aug 11, 2026

asked Aug 11, 2026 by George Tedrick

iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

1 Answer

iMac won't turn on, only LED 1 on, PSU is buzzing

iMac Intel 27" Retina 5K Display (Late 2014 & 2015) 1 Answer

Random Technology 950

Unaccepted an answer

Aug 10, 2026

answer unaccepted Aug 10, 2026 by Random Technology

1 Answer

Why is my iMac Intel 27" startup drive missing?

accepted iMac Intel 27" EMC 2546 1 Answer

Lou 11

Accepted an answer

Jul 28, 2026

answer accepted Jul 28, 2026 by Lou

1 Answer

Replacing logic board in 27” iMac emc 2546

iMac Intel 27" EMC 2546 1 Answer

Theo Grefalda 656

Commented

Jul 24, 2026

commented Jul 24, 2026 by Theo Grefalda

0 Answers

Are there multiple iterations of the 2011 iMac 27in?

unanswered iMac Intel 27" EMC 2429 0 Answers

Rowan Maddox

Edited by author

Jun 5, 2026

edited by author Jun 5, 2026 by Rowan Maddox

1 Answer

Connecting new power supply

iMac Intel 27" Retina 5K Display 2019 1 Answer

DanJ 502.2k

Answered

May 27, 2026

answered May 27, 2026 by DanJ

1 Answer

SDD ribbon cable replacement

iMac Intel 27" Retina 5K Display 2020 1 Answer

DanJ 502.2k

Answered

May 2, 2026

answered May 2, 2026 by DanJ

1 Answer

Is Velcro or 3M Dual Lock a good substitute for display adhesive?

accepted iMac Intel 27" Retina 5K Display (Late 2014 & 2015) 1 Answer

DanJ 502.2k

Commented

Apr 26, 2026

commented Apr 26, 2026 by DanJ

iMac Intel 27" Retina 5K Display (Mid 2017)

1 Answer

Will an HDD from an existing fusion drive work with a different ssd?

accepted iMac Intel 27" Retina 5K Display (Mid 2017) 1 Answer

Armen Orbelyan 146

Accepted an answer

Mar 31, 2026

answer accepted Mar 31, 2026 by Armen Orbelyan

1 Answer

Maximum fan speeds and CPU throttled after replacing CPU thermal paste

iMac Intel 27" Retina 5K Display 2019 1 Answer

DanJ 502.2k

Answered

Mar 25, 2026

answered Mar 25, 2026 by DanJ

1 Answer

Mid 2011 27inch Not booting After CPU Upgrade

iMac Intel 27" EMC 2429 1 Answer

Amazing FiXeR 393

Answered

Mar 24, 2026

answered Mar 24, 2026 by Amazing FiXeR

2 Answers

Kernel panic when CPU is hot for long time

iMac Intel 27" Retina 5K Display 2020 2 Answers

Amazing FiXeR 393

Commented

Mar 24, 2026

commented Mar 24, 2026 by Amazing FiXeR

1 Answer

Is replacing the blade ssd worth it for the late 2015 iMac

iMac Intel 27" Retina 5K Display (Late 2014 & 2015) 1 Answer

redratchet21 2.9k

Answered

Mar 16, 2026

answered Mar 16, 2026 by redratchet21

1 Answer

iMac late 2013 wont turn on - single LED on

iMac Intel 27" EMC 2639 1 Answer

Random Technology 950

Answered

Aug 21, 2026

answered Aug 21, 2026 by Random Technology

3 Answers

Hi. Suddenly, sound disappeared from speakers.

iMac Intel 27" Retina 5K Display (Late 2014 & 2015) 3 Answers

Mark D Schlossman 8k

Answered

Feb 23, 2026

answered Feb 23, 2026 by Mark D Schlossman

1 Answer

Suddenly I have the ‘prohibitory symbol’ on my 2017 27” iMac

iMac Intel 27" Retina 5K Display (Mid 2017) 1 Answer

DanJ 502.2k

Answered

Feb 20, 2026

answered Feb 20, 2026 by DanJ

2 Answers

Mac startup sound plays but display wont turn on

iMac Intel 27" Retina 5K Display 2020 2 Answers

SAO

Commented

Feb 12, 2026

commented Feb 12, 2026 by SAO

1 Answer

2TB fusion hard drive dead...Replace with internal or ...?

iMac Intel 27" Retina 5K Display (Mid 2017) 1 Answer

polonius007

Answered

Feb 15, 2026

answered Feb 15, 2026 by polonius007

1 Answer

2010 27" iMac OSX wifi BT upgrade - special USB cable

iMac Intel 27" EMC 2390 1 Answer

Ralph Brown

Commented

Jan 26, 2026

commented Jan 26, 2026 by Ralph Brown