iMac in reboot loop black screen and chime, keyboard not recognize.

Question

iMac Intel 24" EMC 2134 and 2211

Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

433вопросов Показать все

Jim @jimks

Репутация: 1

1

Опубликовано: 5 мая 2020 г.

Опции

iMac in reboot loop black screen and chime, keyboard not recognize.

Hi,

First of all, I have to thanks the all community on Ifixit. So many Topics helped me so much. Now I guess it is my time to ask you guys some help, please.

My iMac (VM831NV60KM) suddenly stopped working while I was using it.

Now, it’s rebooting in loop with black light, chime, fan but no keyboard recognized .

LED Diagnostic showed 4 LED lights are working. all ON, I mean.

I’m wondering if the problem can be the CPU, Logic Board, or power supply? CPU and power supply should work if the all 4 LED lights are on, isn’t? So it’s the Logic Board?

Thanks for your help.

cheers

Jim

Ответ на этот вопрос У меня та же проблема

Это хороший вопрос?

Да Нет

Оценка 0

3 Комментариев

Hi @mayer any chance to have your expertise on that please ? I have read many many of your expertises and you’ve always been meticulous and pro. Some articles close to my issue have been checked for you, so I am wondering if you can help me a bit please ?

thank you jim

6 мая 2020 г. из Jim

What type of keyboard are you using?

6 мая 2020 г. из mayer

Hi @mayer thanks for replying.

I use a USB apple one. I plugged a USB computer mouse, I have seen its light. but couldn't see any lights from the keyboard, I tried with a another keyboard but not a apple one, no light as well.

so I did all the commands like, ALT, D, Cmd + R, alt + Cmd + P + R, obviously it didnt worked.

I tried to boot the imac with a usb key. everything was the same. It is just rebooting in loop.

6 мая 2020 г. из Jim

Добавить комментарий

5 Ответов

Hi @mayer any chance to have your expertise on that please ? I have read many many of your expertises and you’ve always been meticulous and pro. Some articles close to my issue have been checked for you, so I am wondering if you can help me a bit please ?

thank you jim — Jim
Hi @mayer thanks for replying.

I use a USB apple one. I plugged a USB computer mouse, I have seen its light. but couldn't see any lights from the keyboard, I tried with a another keyboard but not a apple one, no light as well.

so I did all the commands like, ALT, D, Cmd + R, alt + Cmd + P + R, obviously it didnt worked.

I tried to boot the imac with a usb key. everything was the same. It is just rebooting in loop. — Jim

score 1 · Answer 1 · 2020-05-07T08:49:14-07:00

Наиболее полезный ответ

mayer @mayer

Репутация: 685,3к

MacHale Enterprises

3,4к

1,1к

2,6к

Опубликовано: 7 мая 2020 г.

Опции

Apple iMac 24-Inch "Core 2 Duo" 3.06 (Early 2008) Specs

Identifiers: Early 2008 - MB398LL/A - iMac8,1 - A1225 - 2211

This is a very unusual case.

I would first try the keyboard in all the USB slots.

I would be inclined to go for the power supply first. These things can partially fail and supply power to things and not others. Pull it and look for bad capacitors (cans). This was a major issue about the time your machine was produced. Bad caps may have swollen tops and/or show leakage.

UPDATE 5/26/20

If I remember correctly, this machine came with system installation DVDs. Please insert the install DVD, hold down the C key and boot from it and tell us your results.

Был ли этот ответ полезен?

Да Нет

Оценка 1

Добавить комментарий

We Computing @wecomputing Репутация: 67 3 · Answer 2 · 2020-05-05T13:40:44-07:00

We Computing @wecomputing

Репутация: 67

3

Опубликовано: 5 мая 2020 г.

Опции

hi , i doubt it is the CPU , they are rare to go faulty but logic board -Yes if not light at all after 5 min ,

all the best

Был ли этот ответ полезен?

Да Нет

Оценка 0

1 Комментарий:

Hi, thanks !! Well, I am happy to buy a Logic Board and replace it but I'd like to be quite sure. Yep back light then chime then it reboots. 4 led lights are On. Any more advices or things to check ?

5 мая 2020 г. из Jim

Добавить комментарий

Jim @jimks Репутация: 1 1 · Answer 3 · 2020-05-08T06:51:35-07:00

Jim @jimks

Репутация: 1

1

Опубликовано: 8 мая 2020 г.

Опции

Hi @mayer

I checked all usb nothing worked.

i checked the power supply but I have no idea of what is good or wrong so here some pictures

one place looks darker… like I said I don’t know if it’s normal or not.

then when I remove the thin cable, the “thermal paste” ? Had a crack but still in place.

Aslo I just remember, before the imac crashed, days before I had the screen turning black for few seconds or even minutes…while i was working with.

thanks @mayer

Был ли этот ответ полезен?

Да Нет

Оценка 0

2 Комментариев:

I'm not seeing anything unusual on the power supply. Next carefully examine the logic board looking for a burned component.

8 мая 2020 г. из mayer

I will check then. do you think there will be any issue with the little thermal paste's crack ?

8 мая 2020 г. из Jim

Добавить комментарий

Jim @jimks Репутация: 1 1 · Answer 4 · 2020-05-08T11:32:39-07:00

Jim @jimks

Репутация: 1

1

Опубликовано: 8 мая 2020 г.

Опции

The logic board is even more fine

i mean nothing looking bad noticeable.

So yes like I said. Before the iMac crashed. I had the screen turning black for no reason. Sometime secs sometime minutes. I don’t know if that can help

Был ли этот ответ полезен?

Да Нет

Оценка 0

1 Комментарий:

@mayer or anyone, any recommendations ? thanks

have a great day

jim

11 мая 2020 г. из Jim

Добавить комментарий