Why only one good boot after repair?

Question

PowerBook G4 Aluminum 17" 1-1.67 GHz

모델 A1013, A1052, A1085, 또는 A1107 / 1440x900 스크린 해상도

20 질문 전체 보기

Louie @lou1500

평판: 1

1

게시됨: 2011년 3월 26일

옵션

Why only one good boot after repair?

I got a used Powerbook looking to fix it up. At first it would not power up or give any signs of life. I took the upper case off and checked the power button connection. removed the pram for a few minutes and reassembled. I also reseated the RAM. The machine then booted right up, to my surprise. I tried to boot from the CD and it would not. Then I tried to boot up normally and it was back to no signs of life. The power source is good and charges the battery. I don't know what it could be. Please Help.

Thanks

답변되었습니다! 답변 보기 저도 같은 문제가 있습니다

좋은 질문입니까?

예 아니요

점수 -1

댓글 1개

I tried booting without the battery (just the adapter) and still no signs of life. So is it for sure the logic board? I just want to be 100% sure before I spend the money. Thanks for the response. You gave me great info on PMU and PRAM reseting.

Louie 의 2011년 3월 27일

댓글 달기

답변 2개

선택된 해법

mayer @mayer

평판: 687.8k

MacHale Enterprises

3.6k

1.1k

2.6k

게시됨: 2011년 3월 27일

옵션

There's a possibility that you have a root password lockout. I believe this because you did get one restart. Changing the RAM configuration will allow one restart, then it has to be changed again for another if I'm correct. Try zapping the PRAM (command - option - P - R keys on your first restart. One the start you did get what happened?

이 답변이 도움이 되었나요?

예 아니요

점수 5

댓글 10개:

+ mayer is giving you good advice. I am including a link to an article explaining what hes talking about. Don't be put off because the unit discussed is a Mini-- the same procedure applies to yours.

Good luck.

http://www.macworld.com/article/145418/2...

rj713 의 2011년 3월 27일

That is a funny quirk of the Apple firmware. I wonder why they have chosen to do that?? With x86 base systems you get as many tries as you want.

ABCellars 의 2011년 3월 27일

ABCellars, I think that's the point. With a PC, you can just keep trying to crack the password. If a system is stolen, having it lock out like this makes it far less worthwhile for the would-be thief. Not saying it really would stop someone truly determined, but it's just one more thing to slow them down. That, or they're just !#%!#% who don't want people buying used equipment like this, since "true" Apple fans always buy new. (*eye-roll*) :p

Jerry F Nerviano 의 2011년 3월 27일

+ And yes, excellent answer, mayer! Let's hope it solves the problem. If it were a non-Mac, I wouldn't have as much hope with something like this, based on these symptoms.

Jerry F Nerviano 의 2011년 3월 27일

So I still can't get it to boot up again. Here is the order of things I did and results.

1. Tried to boot with power adapter and battery in

RESULT: No signs of life

2. Tried to boot just adapter power

RESULT: No signs of life

3. Removed RAM, upper case, optical drive and PRAM

4. Reassembled with same parts and tried to boot

RESULT: Successful boot to login screen (I do not have password)

5. Tried to reboot from CD

RESULT: Nothing... but then I remembered I forgot to reconnect optical drive!!!

6. Removed RAM and reopened case

7. Reconnected optical drive and reassembled

8. Tried to boot normally

RESULT: Booted up to a gray screen "open firmware" I had to type mac-boot then Successful boot to login screen

9. Tried to shut down and boot from CD

RESULT: NO signs of life

And that is where I am at now.

Louie 의 2011년 3월 28일

댓글 5개 더보기

댓글 달기

I tried booting without the battery (just the adapter) and still no signs of life. So is it for sure the logic board? I just want to be 100% sure before I spend the money. Thanks for the response. You gave me great info on PMU and PRAM reseting. — Louie
+ mayer is giving you good advice. I am including a link to an article explaining what hes talking about. Don't be put off because the unit discussed is a Mini-- the same procedure applies to yours.

Good luck.

http://www.macworld.com/article/145418/2... — rj713
That is a funny quirk of the Apple firmware. I wonder why they have chosen to do that?? With x86 base systems you get as many tries as you want. — ABCellars
ABCellars, I think that's the point. With a PC, you can just keep trying to crack the password. If a system is stolen, having it lock out like this makes it far less worthwhile for the would-be thief. Not saying it really would stop someone truly determined, but it's just one more thing to slow them down. That, or they're just !#%!#% who don't want people buying used equipment like this, since "true" Apple fans always buy new. (*eye-roll*) :p — Jerry F Nerviano
+ And yes, excellent answer, mayer! Let's hope it solves the problem. If it were a non-Mac, I wouldn't have as much hope with something like this, based on these symptoms. — Jerry F Nerviano
So I still can't get it to boot up again. Here is the order of things I did and results.

1. Tried to boot with power adapter and battery in

RESULT: No signs of life

2. Tried to boot just adapter power

RESULT: No signs of life

3. Removed RAM, upper case, optical drive and PRAM

4. Reassembled with same parts and tried to boot

RESULT: Successful boot to login screen (I do not have password)

5. Tried to reboot from CD

RESULT: Nothing... but then I remembered I forgot to reconnect optical drive!!!

6. Removed RAM and reopened case

7. Reconnected optical drive and reassembled

8. Tried to boot normally

RESULT: Booted up to a gray screen "open firmware" I had to type mac-boot then Successful boot to login screen

9. Tried to shut down and boot from CD

RESULT: NO signs of life

And that is where I am at now. — Louie

Bernie @bernie36975 평판: 1.2k 8 30 · Answer 1 · 2011-03-27T04:45:32-07:00

Bernie @bernie36975

평판: 1.2k

8

30

게시됨: 2011년 3월 27일

옵션

Try booting up without battery in the compartment - use just the adaptor for power. If it works, reset the PRAM and PMU (power management unit) by unplugging the adaptor for a minute, then press the power button for 10 seconds. Replug the adaptor again, press power button and immediately press <commnad> <option> <P> <R> before the welcome chime is heard. I know it's hard, but an assistant to press the power button for you would be a real advantage. Maintain pressing on all 4 keys until you hear the chime, wait until another chime comes, then release. Power down, insert the battery and you should be good to go.

If this doesn't work, then it's a really bad logic board you're looking at.

이 답변이 도움이 되었나요?

예 아니요

점수 2

댓글 1개:

Too soon to blame the logic board. See mayers answer.

rj713 의 2011년 3월 27일

댓글 달기

PowerBook G4 Aluminum 17" 1-1.67 GHz

Why only one good boot after repair?

답변 2개

답변을 추가하세요