Fix Your Stuff Community Store

Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

212 Questions View all

Options

Why does my iMac have random shutdowns?

My iMac shuts down randomly sometimes within seconds of booting to the desktop and won't restart unless it has been unplugged for several hours. I tried resetting smc, pram, reseating ram to no effect. I took it apart and disconnected the LVDS cable. The iMac booted and ran for 4 hours then I forced a shutdown. Plugged the lvds cable back in and booted, It shut down again within seconds of getting to the desktop. Do I need a new logic board?

Answered! View the answer I have this problem too

Is this a good question?

Yes No
Score 0
Add a comment

2 Answers

Filter by:
Most Helpful Newest Oldest
Chosen Solution

Options

Sounds like you have a failing part or a failing solder joint. The problem is going to be isolating it. There are diagnostic LEDs to the right of the RAM slots on the logic board. We need to see what they are doing before and after it shuts off and what they do when you attempt a restart. There may be a piece of black electrical tape covering these lights, it can be removed.

Was this answer helpful?

Yes No
Score 1

5 Comments:

Hi, and thanks! I just booted (lvds still disconnected) to check but there are no LEDs around the ram slots. I read somewhere (don't remember where) that this model (core duo) doesn't have the diagnostic LEDs. Is there another way to narrow down this problem? Thanks again!

by

No joy? Thanks, lee

by

Hook it up to an external monitor to try to isolate the problem.

by

Good advice +

by

Add a comment

Options

Screw that answer. Run Disk utility>repair disk permissions (in the applications folder) and on a regular basis (every 6 months) run Erase free space in the disk utility. It takes 45 (minimum) minutes and you want to have your fans running at a pretty good speed while it is running.

Was this answer helpful?

Yes No
Score 0
Add a comment

Add your answer

Lee will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 1

All Time: 1,522