I have a couple of vertical lines on my display - the number of lines are growing slowly(6 at the moment)

I mirrored the display on my TV , no lines there.

Is it the display panel itself or could be the wire connects the logic board to the LCD?

Or something else?

Thanks.

I did lot a research on the web, and figured there are lots of people who suffered from the same issue.

There are two possible solutions:

1. You buy LCD panel online and take it to a pc shop and pay for repair.

2. Make a lots of phonecalls to apple and if you pushy enough might get lucky and apple might fix it for you for 30-50$. They changed mine LCD. Said there was a factory defect on some of the LCDs for the G5s.

Give it a try! Good luck

Here's a useful thread to check.

⟐ Answer deleted August 08, 2014 at 2:29 MST

This computer is a few years old and I'd like to clean the dust out with a can of compressed air to make it run a little better. I've successfully opened and re-assembled an Xbox 360 in the past successfully without problems.

So what I'm asking is, is it worth the trouble?

⟐ Answer accepted August 11, 2016 at 12:16 MST

Zapped pram, rebuilt permissions, and repaired disk, no improvement.

Disk utility, and techTool both reported OK, but took forever to run the tests.

Replaced internal drive with new, same results.

Everything is fine when starting from a cloned system on any external drive. (firewire,usb,flash, all work fine.)

I now suspect the HD cable, HD controller, or power supplies.

Any idea what to check next?

-Mike

⟐ Comment deleted July 11, 2018 at 6:34 MST

iMac G5 17" Model A1144

⟐ Answer accepted February 03, 2010 at 15:22 MST

Fiollowing the description...

ATI Radeon X600 Pro:

Modello Chipset: ATY,RV370

Tipo: Monitor

Bus: PCI

Slot: PCI-E

VRAM (totale): 128 MB

Fornitore: ATI (0x1002)

ID dispositivo: 0x5b62

ID revisione: 0x0000

Revisione ROM: 113-xxxxx-113

Monitor:

iMac:

Tipo di monitor: LCD

Risoluzione: 1440 x 900

Profondità: Colore 32-bit

Integrato: Sì

Core Image: Non Supportato

Monitor principale: Sì

Mirror: Spento

Online: Sì

Quartz Extreme: Non Supportato

Monitor:

Stato: Nessun monitor collegato

...............

Has anyone idea about what's happening? I can't use my Mac in this state...

Thank you very much for any help and suggesty.

Gaetano Zagra - Italy

⟐ Answered December 26, 2012 at 22:14 MST

I have an iMac that one day booted up to the folder/question mark screen. I decided to try disk warrior which couldn't find the hard drive at all. Of course my first instinct was that the HD was dead so I decided to throw in a known good Hd that I had lying around. Turns out that that hd couldn't be found either. I could tell the Hd was getting power so I tried a known good sata data cable. Still nothing. Also I tried to put it in target disk mode but the fans just started blasting and the screen would stay black. I'm assuming that's what happens when there isn't a disk to be targeted.

Other things I tried was starting from a leopard dvd and using disk utility. No disk appears! An external usb drive showed up though after I plugged it in. I proceeded to try to install leopard to the external drive but it failed part way. Also I wasn't able to boot from the original disk after I pulled it from the machine and put it in an enclosure. It would not even show up as a startup disk! I started to suspect the logic board but a ran the ASD utility disc looped for 7 hours and the machine passed!

Could it be that just the connector for the SATA drive on the logic board is faulty? Anyone else had this problem?

Thanks,

Cory

⟐ Comment deleted February 27, 2016 at 2:26 MST

but now after having reassembled it, when i hit the power button the computer makes the chime and the power light switches on and the fan starts working, then starts working even harder and then the whole machine immediately switches off. This all happens in about 2 seconds.

⟐ Answer accepted April 13, 2014 at 3:58 MST

⟐ Answer accepted February 02, 2010 at 11:49 MST

for instance, if the computer is playing music the song will get stuck on the second it switched to the purple green screen.

I thought it may be a heating problem because once the computer has been switched off after the problem it does not start again properly.

I cleaned out all the dust stuck in the fans and the rest of the computer to no luck.

anyone have any ideas?

⟐ Commented June 05, 2022 at 13:13 MST

⟐ Answered May 06, 2016 at 6:08 MST

My computer was working then one day it was off and I can't get any response (power) at all. I have read about power supply and motherboard issue but don't know where to start. Is it worth trying to replace the power supply ($140)? Is this the right first step?

⟐ Answer accepted April 29, 2014 at 7:39 MST

The power supply is OK (12,5,3.3V) leaving the dc/dc - without the LB plugged in the HD will spin and I get the proper volts at the connector. But when I plug it into the LB and power on the #1 LED blinks and the power supply shuts down... I have reset the PMU. I suspect the caps, I checked all them a hundred times but I can't get an accurate reading on the caps because they are in series. I would hate to have to replace them again

Does anyone know why the trickle voltage would make it shut off? Any ideas where I should look first? Troubleshooting ideas?

⟐ Answer accepted October 29, 2010 at 15:16 MST

As the photo shows, I wonder how do I connect them back in correct sequence, black-white-green-red?

⟐ Answered February 28, 2010 at 18:57 MST

Daryn

⟐ Answer accepted January 04, 2016 at 8:54 MST

⟐ Answered July 26, 2015 at 0:16 MST

I have searched the forum for this issue, but can't seem to find a similar problem.

I have an iMac 17 iSight. No issues with vertical lines, dark areas or funny colours. The issue I have is that from time to time, well it's getting more frequent the screen will go black, the computer is still running and I can here volume increase noises and so on.

To counter this I attached a second monitor, which worked well, but now this is playing up and going black, I have checked it on another mac and its fine, the mini dvi is also fine.

I can gather that both screens are turning off at the same time, not separately. So the iMac is suddenly losing its ability to show the screen

Is this a graphics card issue, lose connection, something I can fix, I have reset PRAM, SCU and everything else I can think of.

This is not my main machine, it has Skype on as we'll as Office and hats it, so it's not being overworked.

Anyone had the same issue, as I said the screen is vibrant and clear....

⟐ Answer accepted March 13, 2015 at 16:47 MST

⟐ Answer accepted February 05, 2015 at 5:11 MST

I looked at http://support.apple.com/kb/TS2094 but that seems to be only for the iMac G5 iSight 20", not the 17" - in any case resetting the PRAM did not help. I opened up the case, removing the front bezzel and peeling back the black metal tape, but cannot find the diagnostic LEDs - where are they?

⟐ Answer accepted October 06, 2014 at 20:27 MST

The system does the following:

After pluging in the power-cord diagnostic LED 1 lights on.

After switching it on the following occurs:

1. NO (!!!) start-chime
2. Diagnostic LED 3 flashes very shortly (10ms)
3. Diagnostic LED 2 flashes very shortly after LED 3
4. the right fan runs normal
5. the Power-LED (which is see through the case) is on
6. the optical drive goes in begin state
7. the HD sprins up and goes in begin state

The system turns exactly after 1 minute all fans in full blow mode...

_______________

What did I have checked?

1. the main powersupply:

- 12V is OK and stable

- 3,3V is OK and stable

2. the other voltages are produced on a combo-board, with the inverter for teh TFT.

I measured the following voltages and they correspond to the printed voltages on the mainboard:

• 3,3V all

• 3,3V run

• 5V all

• 5V run

• 12V all

• 12V run

But there are two lines in the plug on position 1 and 8 (white and gray cables) there is no voltage and they are not GND!

Does anyone can say, what these two cables to have been supposed?

I have numbered the cables of the plug in this way:

_________________________

| 01 | 02 | 03  | 04  | 05  | 06 | 07 |

_________________________

| 08 | 09 | 10 | 11 | 12 | 13 | 14 |

_________________________

When you lay down the open iMac with the top towards you and take a look to the cables then the white and the gray cable should be at the left side...

Btw. I've just changed all the ELCOs on the mainboard with Low-ESR-Elcos, but it is the same problem with the iMac!!!

Best regards

Georg

⟐ Answer accepted August 03, 2014 at 18:40 MST

I'm working on reviving an iMac G5 17" Model A1144 and I've come across some roadblocks. The primary issue is that recently during normal use it randomly powered off a few times and then stopped being able to be powered on entirely. I know it's old, but I've seen Macs last well beyond this!

So far, I've replaced the power inlet, the power supply, the DC-DC board, and the logic board with no change in symptoms. None of the LED indicators have lit up throughout this entire process.

That means I've replaced all but two internal components that deal with powering up the iMac (I believe I took everything else into account, so correct me if I'm wrong).

Those two components are the DC cable (connecting the DC-DC board to the logic board) and the power button. I've purchased both of those components and am waiting for their arrival.

Does anyone have any advice for removing the power button switch board in this model iMac (I plan to test the new one before removing the old one, incase it's a destructive swap) or any other ideas on how to bring this iMac back with all the work I've put into it? Am I not seeing something obvious?

Thank you in advance, iFixit self-repair community!

⟐ Answer accepted July 11, 2014 at 19:23 MST