Replacing motherboard on Dual 1.42 MDD FW800 Power Mac

I need to replace the motherboard on my Dual 1.42 MDD FW800 Power Mac.
Can someone guide me to the correct board I need to purchase? I did a search but couldn't easily find a clear-cut answer... I figure it is common knowledge for some here.
Thank you!
Message was edited by: Play

Hi-
Should be This board.
Confirm the serial number of your existing board.

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Replacement Motherboard for Dual 1ghz MDD G4

My original motherboard for my G4 is toast.
What replacement Motherboards are compatible with my dual 1ghz
mdd G4?
The white sticker on board reads: 630T3984/630-4256
Thanks
Eric

Ouch, I was hoping it wouldn't be one of those.
I think it has to be the same. My info comes from an Apple document discussing CPU upgrades.
Wait ... quoted -
Before Replacing the Processor
Important:
Apple has determined a compatibility issue between the processor and certain
fabrication levels of the logic board on some Power Mac Server G4 (Mirrored Drive Doors)
and Power Mac G4 (Mirrored Drive Doors) products. Before ordering a replacement
processor for those models, follow these steps:
1. Open the computer and check the fabrication number that is printed on the logic
board. The fabrication number is easily visible at the edge of the board near PCI card
slot 5.
2. If the logic board fabrication number is 820-1308, 820-1440, or 820-1445, do
not
order the processor module. Instead, you must replace both the logic board and the
processor by ordering the combined module: Module Set, Logic and Processor (Apple
part number 661-3654).
Replacement Warning:
When ordering this combined module set, a returned logic
board must match one of the three fabrication numbers (820-1308, 820-1440, or 820-
1445). If the logic board does not match one of these fabrication numbers, it will be
rejected.
3. If the logic board fabrication number is any other number (
not
820-1308, 820-1440, or
820-1445), order only the multiprocessor module (Apple part number 661-2730).
So make of it what you will. If your email address is in your profile, I'll email the whole document - it's a bible for MDD owners - shows you how to remove and replace everything, with photos. It's only 3.3MB.

Power Mac G5 Dual 2.5 freezes up, Power Mac G5 Dual 2.5 freezes up

Hello
I inherited a Dual 2.5 PPC Power Mac G5 from my sister. She was having problems with it suddenly freezing up. She replaced the hard drive but that didn't fix it, and sicne she had a newer Macbook Pro she gave up on it. When I got it I replaced the video card on it with an ATI Radeon, and it seemed to run fine for a while, and then the problem returned. It seemed to have returned after I did all the Apple software upgrades on it (It's running Leopard), but that might be a coincidence. I noticed under Diagnostics on the power up test that some RAM had failed. I also noticed that it was running on 1 gb of RAM even though 2 gb were installed. I removed the faulty Ram (4 256 mb dimms) and hoped that that was the problem. Unfortunately it wasn't. I also installed a temperture reading program. It showed that CPU A is running around 80 C at times and is usually about 10C hotter than CPU B. I'm not sure though if 80C is normal for a G5 or not. I noticed that when it was unplugged that it wouldn't retain the time and date, and took a look at the battery, and sure enough it was starting to leak (but hadn't leaked on to any components). I've ordered a new bttery for it.
I ran a check with Disk Utility and found the HD was ok, but permissions were a bit messed up. Disk Utility wasn't able to fix some of the permissions, but i don't think this is the underlying problem.
I've also opened it and gave everything a thourough vacuuming and cleaning and reseated any removable parts. I took the cover off the liquid cooling unit and vacuumed out the dust. There didn;t seem to be any coolant leaks I could see.
Any suggestions on where I should go from here? I unfortuantely don't have any of the disks for it, so I can't run the AHT until I find one for it (the one for my Macbook Pro wouldn't work).
Sometimes it just freezes. Other times it freezes and the computer fans go on high. It will finally get to a point where it shows the grey multi-language restart screen (where it says to hold down the button to shut it off and the restart).
It was frustrating because on my workbench it was running fine after I switched the video card, and it didn't freeze at all. When I moved it to our computer desk though, the problems returned. Tonight it was to the point where it didn't last 5 minutes.
My thoughts are:
1. Maybe All the RAM is bad
2. Maybe the dead battery is messing it up?
3. When it is heating up with use, something is expanding and not connecting any longer.
What are your thoughts?

Hi Curtis,
I'm not sure though if 80C is normal for a G5 or not. I noticed that when it was unplugged that it wouldn't retain the time
Nope, not normal, way too hot, above 70°C... If you have any temps in the 70°C/160°F range, that's likely it.
Have you blown the dust out of everything with high pressure air?\
1. Maybe All the RAM is bad
The Memory test can really only be trusted if it finds a problem, not if it doesn't find a problem.
Memtest OS X...
http://www.memtestosx.org/joomla/index.php
Rember is a freeware GUI for the memtest ...
http://tech.kateva.org/2005/10/rember-freeware-memory-test-utility.html
If you're sure the RAM is good, try the Hair Dryer trick...
http://discussions.apple.com/message.jspa?messageID=13240047#13240047
https://discussions.apple.com/message/15223603#15223603
https://discussions.apple.com/message/15499912#15499912
https://discussions.apple.com/message/15613068#15613068
It can show on any G5, and even many other computers & electronic devices of the period.
http://www.macintouch.com/reliability/pmg5.html
http://lowendmac.com/ppc/power-macintosh-g5.html
2. Maybe the dead battery is messing it up?
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange startup problems, thoigh not once vooted as a rule...
See which one your G5 has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
3. When it is heating up with use, something is expanding and not connecting any longer.
Could be the lead free solder issue with the RAM slot, and/or the thermal paste between CPUs & heatsinks need replacing...
https://discussions.apple.com/message/16223700#16223700

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I ordered a Power Mac G4 and I have an internal dual layer DVD drive with lightscribe built into it. I installed it in my PC awhile ago and it works fine but I want to know if it will work in a Power Mac G4 running OS X (Tiger/Leopard)? The model number is IDVD16DLS and it's manufactured by I/O Magic. It's a really good drive and I hope it works on Mac.

Optical drives sold by I/O Magic are usually manufactured by any of a number of electronics plants in China. The drive will undoubtedly function in your G4, but it may not respond to booting with the C key depressed or boot the computer after having been designated as the startup disk. I tried a Memorex (LG-manufactured) DVD±RW drive in a B&W G3 (Panther), and even with the PatchBurn profile, the only way to force it to boot from a bootable CD/DVD disk was to immediately close the tray, after it would spin up/down at startup and eject the disk. I removed that drive and installed a Pioneer DVR±RW drive like this one in black or beige. The Pioneer burner boots the computer without the extra persuasion. Tiger is more forgiving of a third-party drive, than the previous OS X versions. As for the LightScribe function, you'll probably need to look for third-party, Mac-compatible labeling software.

Replacing ata in dual 1.25 mdd powermac

hello everyone. i usually don't post qustions on the board because i normally find whatever it is i'm looking for, but this time i'm out of options. i'm currently trying to swap out the factory installed ATA in a powermac G4 MDD dual 1.25 and i cannot get the drive carrier out. I cannot find any help online. All the support apple gives is how to install additional drives, not replace the one they put in.
This hdd is failing and it needs to go. However, pulling back on the tab on the left side of the carrier does nothing. Supposedly you can just pull back (towards yourself) on the tab and slide the hdd/carrier up slightly to take out the ide and power cables. This does not work. The tab can be pulled, but nothing happens. I took out the screw at the top of the carrier only to have it fall in between the hdd and side panel. Removing the screw also did nothing. It seems as if there are multiple screws holding the carrier into place and how the carrier is in the case makes it nearly impossible to get to any other screws.
Any help?

Hello! have you watched the video for removing the carrier from OWC? Tom
http://eshop.macsales.com/tech_center/index.cfm?page=Video/harddrive/g4mddata133 /high.html

G5 Dual 2.5 (June 2004) Power Mac LOCKS UP After 20 -30 Minutes

Ever since the Apple 5.1.8f7 firmware update just before Christmas, my poor G5 Dual 2.5 will boot and run for about 20 to 30 minutes then lock up hard. No keyboard and no mouse activity. Have re-set the PRAM, swapped out the video card, swapped out the memory, and replaced the logic board battery but no change. No errors on boot up. No kernal errors or panic. Doesn't matter what program I am in when the lock up occurs. Really need this machine and welcome any thoughts or help. Thanks.

Hi-
Will it run in Safe Mode (hold Shift while starting)?
http://support.apple.com/kb/HT1564?viewlocale=en_US
Safe mode takes a bit longer to boot, as system checks/repairs are being made.
Be patient.

Where can I find a replacement acrylic case (maybe new?) for my Power Mac G4 Cube?

Support Community,
I'm upgrading my Cube and while I'm at it, I'd like to replace the case. I bought it used and it came with those infamous stress cracks on the top and I'd really like to put this back into pristine condition. Does Apple still carry these cases as a replacement part? How about the mouse/keyboard/speakers? Anyone know of one of these NIB collecting dust on a shelf somewhere? Maybe, just maybe...
Thanks,
Jerry

Hello Jerry,
I found this on the web: http://www.welovemacs.com/apg4cu50capa.html
They seem to have a variety of parts and I've purchased things from them in the past. No complaints.
Gary

FW800 power on failure

MDD 1.42 Ghz G4 Dual Processor PowerMac/FW800.
Will not start up.
Symptoms are
LED behind power button lights for an instant. Subsequent presses have no light.
Unplugging and plugging AC cord results in momentary LED flash when pressing the power button. Again, subsequent presses have no light.
I replaces the PRAM battery (dated 2003 and had been in the Mac at least that long.) Same results when pressing power button.
When the Mac is opened, and the power button pressed, the small fan by the logic board spins briefly. Subsequently pressing the power button has no effect.
After several days trying to restart the computer again, I noticed that this fan did not spin up as long as before. I suspect that the logic board is drawing current from the new backup battery and has drained it slightly. The battery has been removed.
Reading previous 'FW800 power on problem' threads here, it appears that I possibly have a malfunctioning power supply.
Is this an accurate assessment?
Power Supply label details:
API1PC36
Customer ID: 292
Rev.A
Barcode: FZ303AWP0VA
If I recall correctly, Apple offered a new, quieter power supply for this particular Macintosh.
Do I have the replacement in my Mac, and if not, can I still get one from Apple for a reasonable cost?
Sincere thanks in advance for any aid in getting my FW800 back in operation.

Do I have the replacement in my Mac, and if not, can I still get one from Apple for a reasonable cost?
Part A: The power rating should be on the PS label. The original noisy models were 400W; the quieter ones that were used in the exchange and subsequently in all production models, was 360W.
Part B; Don;t know about current availability from Apple. At some point, Apple was charging more for the PS that a FW800 or MDD was worth on the private sale market. When my son's MDD PS died, I found a replacement in the used/pulled market. The one I bought is here, although I noticed the price has gone up again:
MDD/FW800 Power Supply
Another option if you live in an area with a lot of little shops is to have the old PS evaluated and repaired if possible. Don;t take it to a computer shop--they will give you a blank stare and parrot, "Replace! Replace!." Find an electronics shop that specializes in power supplies and ask if they will look at it.
This makes sense because one poster here reported that, after an MDD PS failure,he opened the PS himself (NOT RECOMMENDED!) and found a poorly-done solder joint that had failed. Resoldering (or "reflowing" in some countries) the connection restored the PS. Again, get professional's help. If the PS is repairable, the cost of the evaluation and repair could be much less than the cost of the used one I linked above.

Correct way to burn DVD-R Dual Layer? Power Mac G5 or MBP Early 2008?

I have several software titles I have purchased and they are on dual layer dvd, I am using Philips DVD-R dual layer, I have a Power Mac G5 and an early 2008 Mac Book Pro, I have been unable to successfully burn a back-up on either drive. I am noticing dual layer seem to be an major problem across the board, but in the past this has been the place I come to get my answers.
Thank You in advance,
Sebastian

http://lifehacker.com/251758/mac-tip--how-to-burn-an-iso-or-dmg-file-to-disc
I believe this is pretty much what I did. ^
http://discussions.apple.com/thread.jspa?threadID=1453988&tstart=0
here are some possible solutions for your error... ^
keep me updated and let me know if anything works....

G4 MDD FW800 Dual Boot Tiger and Leopard

I have a Power Mac G4 1.25 Dual MDD FW800 currently running Tiger 10.4.9. I would like to install Leopard on a partition or a second hard drive so I can dual boot between Tiger and Leopard. Will the FW800 model allow this without eliminating Tiger or creating any issues with using Tiger? I recall reading somewhere that the MDD FW800 could not run Jaguar and Tiger concurrently but I don't know if this is true? Anyone running this Tiger-Leopard dual boot setup?
Thanks Della

Your MDD's are FW800 also?
What you are asking doesn't matter.
ALL G4 machines, including ALL MDD machines, including the FW800 CAN maintain two or more OS versions (such as Tiger and Leopard) and CAN boot back and forth between the versions.
Any G4 that I have ever had, Sawtooth to MDD/FW800 has run two, three and four OS versions.
I currently have OS9, Panther, Tiger and Leopard installed on this machine.
Another source had told me that the FW800 MDD could not boot back to a previous version OS once a newer version OS had been installed ie once Leopard was installed you could not boot from Tiger again from another startup disk?
Your source is incorrect, and is telling you contrary to all the content of the entire internet regarding the topic.
The FW800 cannot boot to OS 9 (any version) nor can it boot to OS X earlier than 10.2.3.
As with ANY G4, it cannot run OS X Snow Leopard (10.6).
Those are the ONLY limitations.
ALL other OS versions after OS X 10.2.3, in any number of combinations, may be present as boot volumes on the machine.
If you had 4 drives with 3 OS versions each, as long as the version was within the machines compatibility, it would be fine and boot would be supported.

Whats the Largest Drive and/or Partition on G4 MDD/Fw800 dual 1.25?

Whats the Largest Drive and/or Partition on G4 MDD/Fw800 dual 1.25?
Hi, Protools user here, using my G4MDD/Fw800 and Macbookpro, i like of course to have interchangability, if i can.
1- Whats the maximum size internal partition my G4 can read? one drive of 750gig?
2- Whats the maximum size Fw800 Drive my G4 can read? one drive of 750gig?
2a is it the same for fw400?
3- Are there 2 separate internal buses on my G4 MDD?
I just bought a 500 gig hitachi, IDE, popped it in an OWC fw800 case and was having errors dragging huge folders from my g4's internal 233gb drive to the Fw800 on the external bus
Hope everybody understands my questions. Appreciate some help.
<Edited by Host>

For 10.3, the HFS+ size limit is 16TB.
HT2422- Mac OS X: Mac OS Extended format (HFS Plus) volume and file limits
The Mirrored Drive Doors Macs are not limited to built-in IDE/ATA 128 GB Drive size limit.
HT2544- Macintosh: Using 128 GB or Larger ATA Hard Drives
There are two IDE/ATA Busses for hard drives in your Mirrored drive Doors G4. The front pair of drives are ATA/66, the rear two are ATA/100. The CD/DVD nest is supported by a separate ATA/33 Bus.
Drive size limits do not explain why you are getting errors. More information is needed.

Power Mac G4 MDD: Swapping out motherboards

I have two G4 MDD's. An FW800 dual 1.25 GHz which just blew the power supply(the 23 pin connector fails to get 25V). And I just bought a used MDD 2003 which is, so far, running fine.
I have a reasonable amount of electronics know-how. And I'm learning to do my own PowerMac 'tech' work since I got the FW800 two years ago.
So, how do I swap the dual 1.25 board for the 2003 single 1.25 board without 'winging it' into disaster.
I will appreciate instructions.
Shamus

I've done many power supply swaps and removals.
It's easier to just swap the power supply.
However, if you've gotten this far, why not stick with the original cpu and logic board.
On the other hand the other logic board may work as it has a 167 bus as well.
I personally have swapped dual 867 cpus into fw800 motherboards from 1ghz units as they are both 133 bus. Also used 1.25ghz logic board to replace a dual 1ghz cpu logic board as they are 167 bus each.
Still say if you got this far just replace with the originals.

PowerMac G4 MDD (FW800) will NOT boot...possible PSU????

Hi - just bought a used Dual 1.42 MDD with FW800....replaced the heatsink, RAM, hard drive, and DVD drive and was trying to boot it to load 10.5. I can not get it to boot or display any video beofre going to the fail-safe fan rush.
I searched the forum and read several posts concerning MDDs not being able to boot.....so I have performed some of the recommended troubleshooting steps - no avail. So here is my situation and the facts:
This is what happens when you power up the unit:
1. Both fans power up.
2. Red light on the motherboard lights
3. DVD (brand new) does an initial spin with the light coming on for about 8-10 seconds
4. Then fans go into overdrive with a loud, continuous roar
5. No video out
6. Seems the hard drives do not power up.
Here's what I have done so far:
1. Reset the PMU several times and different recommended techniques
2. Removed the battery, probably needs replacing...but should boot w/out it...right?
3. Swapped bootable drives...checked jumpers...still no power going to drives
4. The CAPS LOCK light on the Apple keyboard will not come on...so possibly the USB ports are not getting power
5. reseated the video card as well as all the RAM modules
I will test the PSU based on the recommendations from other posts - but was curious, based on the above facts, can it be safely determined that the PSU is bad (no CAPS LOCK light and no power to hard drives).
Any other ideas or suggestions....thanks.
jc

I agree with Japamac, it's odd that the HDs aren't spinning up. I bet they are but you can't hear them over the fans. The best it to use tester on them. Another thought it to unplug the fans, and startup the MDD with the case open -- be sure you ground yourself. You'll probably hear the HD 'click' when they startup; otherwise, if you touch the top (non-circuit board side) you can usually hear them vibrate.
Even if the HDs weren't getting any power, I'm not sure that would cause the wicked fans. One thing you can try is to disconnect the data cables to the HDs (and the power too), and see if the Mac will boot without the roaring fans. If possibile try booting from the Installer CD -- hold down the mouse button at startup to open the tray. You may need to boot again to actually boot from the CD/DVD. Completely dead HDs on the data buses can cause your Macs to have fits -- if they're not getting any power they'll appear dead.
I will not say with authority that it's not the PSU, but it may not. I've experienced what you described twice -- all issues with CPU board.
1. I bought for about $10 a condition-unknown 1.42 GHz dual card (low risk, high reward). At startup I get the bong, mb lights, no video signal, and the roar of the fans. The card gives roaring fans on both my 133MHz and 167MHz boards, which I know both work.
2. When I tried to undo an unsuccessul 133MHz to 167MHz motherboard FSB overclock. I didn't stir my conductive paint well, and I suspect the CPUs were clocked differently or overclocked way too high. I got the roaring fans at startup in this unstable situation with my bad paint job on the bus-multipliers (on the CPU board) and motherboard.
Without tinkering with the motherboard. I then put my other known working 1.25GHz dual CPU board, and I started up without issue. So something seemed out of what with the work on the bus-multipliers. I confirmed that when removed all the paint, put the other CPU board back in (the one that caused roaring fans with my bad painting) and I started without issue.
I've since gotten better with conductive paint, and the motherboard is back to 133Mhz and that old CPU is clocked properly (and since replaced).

G4 MDD (FW800) processor upgrade

Thinking about upgrading to dual 1.25 processor but curious about different bus
speeds. Apple specs list fsb for single 1Ghz processor at 133 MHz and for dual 1.25 processors at 167 MHz. Can't find p/n's to compare logic boards so is the bus
speed 'fixed' for a specific logic board, or is it changed automatically with a different processor, or do I need to do dip switch/jumper/hard wire changes? The processor I'm looking at on eBay says that it was pulled from a G4 MDD (not specifically from a FW800). I'm not even sure I want to do this since I haven't experienced any noise/overheating problems with the single processor.

I'm searching for information about how to change bus speed on a mdd fw800 with a single 1ghz cpu. How does one make the bus go from 133mhz to 167mhz ? I've seen the pictures on http://www.macbidouille.com/article.php?id=89&page=3 but the motherboard of my G4 does not look like this, at last from the component side.
Does anyone have information about how to switch a MDD G4 fw800 from 133mhz to 167mhz bus ? I'd like to upgrade the cpu in mine and i need new ram anyways so i'd like it to go full speed.

Sick dual 1.0Ghz MDD

I inherited a snazzy dual 1.0ghz G4 MDD and am having trouble diagnosing it's ailment. It chimes when powered on, I can hear the HD spin up, but after about 8-10 seconds the fans spin up to full speed, nothing comes on the screen at all and the fans just continue to spin at full RPM.
One of the processors has a small amount of brown goo caked on near the die (not on the surface, just next to it - similar to the goo that oozes from a capacitor that's blown) and I was able to remove all of the crusty thermal paste and reapply new paste but the same thing happens when I try to start it up. I know little of the machine's history except that the person who owned it was attempting to install the OS at the time it crapped out.
If anyone has had a similar experience or knows what might be wrong please lend a hand. I'd like to be sure of the problem before I rush out and but a replacement MB or CPU.
Thanks!
Dual 1.0Ghz MDD Mac OS X (10.4.8)

Ewww...sounds bad. I've had that happen once. You see, the fans are controlled by the CPU's temperature, and the faster they move, that means the hotter the chip is. Also, that dried out thermal paste was either caused by, or the cause of your problem, as it is either a sign of excessive heat or non adequate heat protection. Sorry to say this, but I think the CPU is fried. That explains the rapid acceleration of the fans. I COULD be wrong, but that is normally what the syptoms describe. I'd have it checked out by a mac genius, as he can give you a more definate answer. If that's the case, you're gonna need a new CPU, or maybe a new logic board.
Powermac G4 "Firewire 800" Mac OS X (10.4.8) Dual Core 1.42ghz G4, 1gb DDR Ram, 120gb hdd, Superdrive, Firewire 800, Airport Extreme

Replacing motherboard on Dual 1.42 MDD FW800 Power Mac

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