Why is the fan loud on bootup

Question

iMac Intel 27インチ Retina 5K ディスプレイ

対象のモデルはA1419 / EMC 2806 / Late 2014 または Mid 2015。 3.3 または 3.5GHz Core i5 または 4.0GHz Core i7 (機種ID iMac15,1)、EMC 2834 late 2015 / 3.3 または 3.5 GHz Core i5 または 4.0 GHz Core i7 (機種ID iMac17,1)のRetina 5Kディスプレイを搭載したすべて。

570回答すべてを表示

Tony G @tonyg19636

評価: 1

投稿日: 2021年6月10日

オプション

Why is the fan loud on bootup

LCD Screen is disconnected. Has Mac chime. Has external video. Fan gradually gets loud. Does not complete booting, it restarts.

Reset SMC and PRAM, no change.

Note: When resetting PRAM. The 1st mac chime is at normal volume, the 2nd mac chime is at much lower volume.

Please help!

この質問に回答する同じ問題があります

この質問は役に立ちましたか？

はいいいえ

スコア 0

1件のコメント:

First your system will ramp up the fan when the internal display is removed! This is normal as SMC has lost access to the display sensors as it assumes things are not right.

SMC will ramp up the fan and lower the CPUs clocking so the system doesn't overheat.

I would carefully reconnect the cables getting the internal display working using some painters tape to hold the screen on. Now using a USB connected keyboard restart your system pressing the D key to enter into diagnostics. Did you get an error, is the fan still racing?

Reference: Mac startup key combinations

Dan さんによる2021年6月10日

コメントを追加

First your system will ramp up the fan when the internal display is removed! This is normal as SMC has lost access to the display sensors as it assumes things are not right.

SMC will ramp up the fan and lower the CPUs clocking so the system doesn't overheat.

I would carefully reconnect the cables getting the internal display working using some painters tape to hold the screen on. Now using a USB connected keyboard restart your system pressing the D key to enter into diagnostics. Did you get an error, is the fan still racing?

Reference: Mac startup key combinations — Dan

iMac Intel 27インチ Retina 5K ディスプレイ

Why is the fan loud on bootup

回答を追加する