no chime / unresponsive to entering recovery mode etc after sudo nvram

Question

MacBook Pro 13インチ Retina Display Mid 2014

モデル番号A1502/2.6GHz（Turbo Boost使用時最大3.1GHz）もしくは2.8GHzTurbo Boost使用時最大3.3GHz）デュアルコアIntel Core i7、4MB共有L3キャッシュに変更可能

494回答すべてを表示

dreiszt @dreiszt

評価: 1

1

投稿日: 2019年11月16日

オプション

no chime / unresponsive to entering recovery mode etc after sudo nvram

I upgraded my A1502 with a NVMe/PCIe SSD (version without adapter which fits directly). was working fine had some sleep/wake failures sometimes so I read through some forums and tried some pmset adjustments in terminal

After auso nvram enable-legacy-orom-behavior=1, nothing worked anymore.

SMC/NVRAM reset does not seem to do anything
Booting from old original SSD with Catalina which was working perfect does not work
Entering safe mode/recovery mode does not work
Completely removing SSD and only starting from catalina usbdrive doesnt work

I get no chime nothing, just flashing question mark folder after a while. Is my logic board fried or whats up?

回答がありました！ 回答を表示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

8 件のコメント

Who's SSD did you use? Make, model & size.

Dan さんによる2019年11月16日

indem 512gb pcie nvme.. but shouldnt make a differnve since i tried booting also from the original apple ssd which is sill working fine. but also non responsive?

dreiszt さんによる2019年11月16日

Your previous question Upgrade to 512gb mSATA/NVME drive is not recognized did you get any help from Indem?

Dan さんによる2019年11月16日

yea they helped, worked fine except some sleep/wake failures from time to time

dreiszt さんによる2019年11月16日

It seems you bricked your Mac for good. Where did you dig out that "auso nvram enable-legacy-orom-behavior=1" command from, just out of curiosity ?

arbaman さんによる2019年11月16日

3件以上のコメントを表示

コメントを追加

4件の回答

ベストアンサー

arbaman @arbaman

評価: 102.6千

10

54

291

投稿日: 2019年11月18日

オプション

@dreiszt Either you were tremendously brave or too excited for having found a solution that you forgot to go through the comments..that guy apparently helped bricking a number of machines..

Try what @danj recommended with Apple. If you have no luck with that, your last resort would be finding someone into component level repairs who can replace your Efi IC with a clean one.

このアンサーは役に立ちましたか？

はいいいえ

スコア 3

2 件のコメント:

Another good reason to stick with the real Apple SSD or one of the major replacement drive makers OWC or Transcend.

Dan さんによる2019年11月18日

@danj If this would be the alternative I would agree. Another lesson I'd take from this, is beware of the random youtube wonderboy.

arbaman さんによる2019年11月18日

コメントを追加

indem 512gb pcie nvme.. but shouldnt make a differnve since i tried booting also from the original apple ssd which is sill working fine. but also non responsive? — dreiszt
Your previous question Upgrade to 512gb mSATA/NVME drive is not recognized did you get any help from Indem? — Dan
yea they helped, worked fine except some sleep/wake failures from time to time — dreiszt
It seems you bricked your Mac for good. Where did you dig out that "auso nvram enable-legacy-orom-behavior=1" command from, just out of curiosity ? — arbaman
Another good reason to stick with the real Apple SSD or one of the major replacement drive makers OWC or Transcend. — Dan
@danj If this would be the alternative I would agree. Another lesson I'd take from this, is beware of the random youtube wonderboy. — arbaman

Dan @danj 評価: 478.9千 Self employed contract worker 35 329 970 · Answer 1 · 2019-11-16T16:38:55-07:00

Dan @danj

評価: 478.9千

Self employed contract worker

35

329

970

投稿日: 2019年11月16日

オプション

Give this a try How to select a different startup disk. You’ll need an external bootable drive to use.

You should also be able to see the drives via the Startup manager pressing the Option key when you restart your system.

Reference: Mac startup key combinations

このアンサーは役に立ちましたか？

はいいいえ

スコア 1

2 件のコメント:

i made a bootable drive. key combinations to enter are unresponsive.

also tried original ssd, wont boot from there either; but is working fine in another macbook.

efi bootrom seems to be bricked? :(

dreiszt さんによる2019年11月16日

Yes the EFI is damaged. Time to visit an Apple Store with the original SSD re-mounted. I would not offer to much info. Let them figure it out. I would only say it messed up during the OS update process.

Dan さんによる2019年11月17日

コメントを追加

Judy Smith @judysmith712 評価: 1 4 · Answer 2 · 2019-11-18T06:26:39-07:00

Judy Smith @judysmith712

評価: 1

4

投稿日: 2019年11月18日

オプション

I believe the EFI is damaged. You need to visit an apple store to check whether it can be fixed.

このアンサーは役に立ちましたか？

はいいいえ

スコア 0

コメントを追加

Rony Ronen @ronyronen 評価: 1 · Answer 3 · 2019-12-23T16:00:00-07:00

I had the same issue. 2 days spent on it.

The MacBook Pro started with black screen, no chime, no Apple logo. After some time it displayed the ? folder.

I tried all the options, but no success, I eventually succeed by doing the NVRAM reset buttons (cmd-opt-R-P) for ALMOST 5 minutes and suddenly heard the chime (I press few time the power button to make sure the system started and continued to press the other 4 buttons). To conclude, I now have Catalina on my MacBook Pro retina 13' early 2015 128GB!

I've upgraded to a Samsung 970 EVO SSD. However, I learned the hard way that it must be via macOS Mojave.

You MUST have a bootable Mojave disk and once the system restart, you should erase the Samsung 970 EVO to reformat it and only then you can restore from backup.

Hope it helps!

BTW: Since the was issue was with Catalina I moved back to my original SSD.

MacBook Pro 13インチ Retina Display Mid 2014

no chime / unresponsive to entering recovery mode etc after sudo nvram

4件の回答

回答を追加する