Switching logic boards

Would swapping a 400Mhz board with a 500Mhz work?
Im 80% sure that it would just need to make sure that there arn't any different parts so nothing goes band when I try it.
Has anyone hand any experience of doing this?

I sent mine in last week for shutdowns and I also mentioned the mushy trackpad button. It's status as of right now is waiting on parts. I called yesterday and they said the logic board has been replaced but they are waiting on a top case and bezel. Mine showed no signs of discoloration but I assume they need to replace the top case as its part of one assembly with the trackpad. The bezel isn't though so I'm not sure if they are just replacing them in all the the macbooks they get in so they won't be sent in again for the yellowing.

Similar Messages

Need Info to repair broken power switch connector on logic board

Hi folks,
I had some bad luck this week. The power switch connector broke off my daughter's Ibook logic board during a HD upgrade attempt. Unfortunately, it pulled enough of the etch that I can't determine where the connections use to go.
I would like to salvage the board. So, if anyone has access to a schematic for the G3 Ibook, 14" 900Mz logic board, I would appreciate some info about the circuit. Specifically, to what components does the switch connect. I already identified one side is grounded and the other side is pulled up to 3V through a 1K resistor, but that etch also went somewhere else. I suppose the gate of a FET transistor. Any help would be greatly appreciated.
Perhaps someone with a dead logic board could trace the circuit with an ohm meter.
Regards,
Spencer

Hi spencer,
Apple doesn't make circuit diagrams available, sorry. I've done or had done component level repairs of iBook logic boards before, usually to re-attach connectors which have come off, but unlike yours, these ones have all come off leaving the trace on the board.
The fact the traces have come off isn't good, as you can probably tell. It's also a 4 layer board, so where the vias go is important. I have a couple of dead logic boards from 500,600 and 700mhz iBooks. The 14 inch logic boards are essentially the same as the 12 inch ones. These pictures are of the area of a 700mhz logic board.
http://theducks.org/pictures/ibook-logic-board-top.JPG
http://theducks.org/pictures/ibook-logic-board-bottom.JPG
Hope it helps.

New MBP logic board and wireless internet does not work anymore

hi there
i had to change the logic board in my only 2 years old MBP15". i purchased a new one and put it in by myself (relatively easy task). i still use the same internal HD as this one still works fine, so all data are the same.
however, the new logic board has obviously a different "identity" from my old one, it came with a sticker which says "ethernet ID 001FF3513E7A" which is different from before. this may be the reason i can still access my wireless network at home, but the self assigned IP address prevents me from connecting to the internet. all settings are as before and it worked always without a problem.
all settings were "automatic" before (using DHCP), and i use exactly the same settings again, but no success. i have to add that i use a new mac mini in the same network with absolutely identical settings (automatic) and this one receives a free IP address from the router (which is only in the last number different from the router's), but the MBP shows a totally different IP address.
i could finally fix it switching to "manual" and adding the same IP address the mini is using and just changed the last number, which has to be different from the time capsule i use as wireless device and the mini. like this everything works just fine.
but why does the mac mini perform everything automatic and the MBP (even with the new ethernet ID - and especially since i connect wireless and not using ethernet) is not able to do so?
i worry if i want to use the internet in any wifi hot spot i may run into troubles...
any idea what the difference between these two machines (with identical settings) is?
thanks and cheers
george

Thank you. It didn't work unfortunately :((
Here are my router's details (Huawei):
Product name HG655b
Device ID 00E0FC-21530307237S0B028701
Hardware version VER.C
Firmware version V100R001C02B018
Batch number RWC3P0.010.29066
Physical address 5C:4C:A9:A5:41:B0
System up time 0 days 0 hours 15 minutes 56 seconds
I don't have Mac filtering enabled.
Now it doesn't even find the wireless network anymore...
My computer and itouch are connected to WAP, but the iphone could not connect to WAP, but only WEP.
Any other ideas?
Thanks a lot!

13 Inch Macbook Pro Logic Board Failure

I've my 13 inch macbook pro (mid 2010) working fine till last week and all of a sudden it gone off while i'am working with it.
When i tried it it switch it on, it is not coming up back. No response at all, when i press the power button even the brething light is not coming up.
No issue with the battery as it is fully charged and even the MagSafe is connected.
I gave it to Apple authorised service center for repair, they initially asked 1000+ buck (INR) for checking it and after checking it i got a response that it is a logic board issue no power is being send to Logic board and it needs an expensive replacement of Rs 33,600.
Not sure why this logic board can't be repaired rather than an expensive replacement..??? Are they doing service or only replacements?
Bought it for 80k and spending another 35k in 3 years is the most annoying thing - a brand new windows laptop costs 35k
Thanks,
Subbu

Apple or an AASP do not "service" logic boards...everything is soldered in place...they replace them.

Power supply vs. logic board? turns off in sleep mode.

My imac g5 (2004 - 1st generation?) is either turning completely off or going into some un-wake-up-able mode after it's put to sleep. (I have to switch off/on the power strip and turn the computer on all over again.) And sometimes if it's sleeping (power light pulsing on front) it may or may not wake from sleep by pushing the power button. Often touching a key in that circumstance will cause it to crash, so I've quit using that altogether as a method of waking it up. I've reset the SMU a number of times throughout the past few months and it has not cleared up this problem.
Last night after I put it to sleep it switched in to the un-wake-up-able mode. I could still hear something running (not a fan, just an electrical hum) where it seems like it's crashed and can't shut itself off. I had to turn off the power and try to turn the computer back on. It wouldn't respond the first couple times. Then the power light glowed for a while but it still didn't turn on completely. After a few more minutes I tried again. Maybe I held the power button for too long, but I heard a long single beep, the fans whirred, and then everything started up as usual.
I've read a number of threads seemingly related to these issues, but am now not clear about whether this is a power supply issue or a logic board issue. I have yet to open the back and check for bulging capacitors. Just thought I'd ask here first.

I am having a very close issue too (posted also in a more recent thread about power button not functioning). My old iMac G5 20 inches got a power supply that went bad two years ago. I had it replaced and all went fine until two weeks ago.
My wife was using it, while I was away: machine shut down with a 'pop!' sound.
She tried to start it up again, but after pressing the button a couple of times - the last one longer - she had a long strong peep. The machine went on for a while and then off again. Scared, she left it off.
After checking, no reported issue seems to fit to the problems shown: power supply is working; logic board too. The machine is working fine, but on sleep, it dies out. While doing tasks, at undetermined times, it shuts down with a 'pop!'. Sometimes you can restart it immediately. Sometimes you can't and have to wait one or more hours. No evidently bad caps on board, led check returns 1 (no 2 flashing or attempting to turn on) with dead computer, otherwise all working fine. Hardware test also passed. Console messages have nothing relevant or clearly understandable to offer.
Still can't figure out a solution. Many user are pretty fast in suggesting to bringing the machine to Apple. Unfortunately not all around the world we have/need cars. And getting the 20 kg of iMac by feet/metro to the shop it ain't such a nice walk. When I fried the power supply, there was no sufficiently large box on sale to pack the computer and have it send to the shop. I had to wait for the technician - on a convenient day - do drop by and take it (and he knew he was going to repair it)!
Will post, if I have further developments.

Help! I have had my iMac G5 fitted with new Logic Board but it doesn't work

Help! I have had my iMac G5 fitted with new Logic Board but it doesn't work
I have just had my iMac G5 First Gen 1.8Ghz fitted with a new Logic Board under the Apple Repair Extension Programme for iMacs.
I got the iMac home from the repairers and switched it on and everything was working fine for about 2 hours and then all of a sudden the Error Page came up on the Screen (with a big On/Off Switch Logo) and it said I had to shut down.
So I shut it down waited a few minutes and then tried to re-boot it but nothing happened. All that happended was the Power Light in the Right hand corner came on..but nothing else....
Help! Any ideas what to do please?

If you have an external firewire drive (it has to be firewire, USB won't boot on a Rev A), plug it in to the firewire port and turn it on, then boot your iMac and see if it shows on the screen.
Have you tried to hit the eject (up arrow, the last button on the top row of the keyboard) button when you boot, perhaps the repairers left a disc in the drive? Then try and put your install disc in.
Miriam

Macbook Pro Mid-2012 Logic Board replacement, Apple Dragging feet?

First some background:
I have a macbook pro 13" Mid-2012 non retina covered under applecare until Jan. 2016. Starting in late march, i had noticed some performance issues but never took it in as the issue would subside within a day or two. Going into the final two week of my college semester, the macbook started freezing and tacking almost 5 minutes to boot. Suddenly it would take 5 tries just to get it to boot. due to this, i had been unable to get the time machine backup to work as it would freeze for 12 hours on average.
So thenI took my macbook pro into the local authorized apple service center (on April 29th) as i suddenly got 'open error 5: input output error' errors and my mbp wouldnt boot at all. When i spoke to the servicer, he and I agreed that at minimum the hard drive was failing. The servicer made a time machine backup of the data on the hdd and got the backup on my external drive. He asked to keep the external drive as it has a partition that is a USB install disk of the latest Mavericks. Soon after he got the data backed up, the hard drive showed signs of failure to happen soon. So we agreedto have him replace the hdd. He hoped to have my macbook to me by May 5th. Well on May 5th, i got a call from him that with the replacement hard drive, the computer still had similar issues and was able to track it down to logic board issues. We agreed that since he had the macbook pro already and since it was applecare covered, we should go ahead and replace the logic board. Anyways, he ordered a new logic board from apple last monday (May 5th, 2014). I called on Thursday for an update and the servicer was frustrated with Apple that something is going on and he hasnt received the part as Apple usually gets him these parts within 1-2 days of request.He said he will call me once Apple gets him the part as he will get on the repair once the part comes in. He hasnt called me back yet.
This is rather frustrating for me as my macbook had all my college files on it and this problem happened right before college finals (i technically lost about 2 months worth of web design files and class files) where much of what needed for finals was on that computer. if he could have gotten it back by the 7th as he'd hoped, i would have been fine. Instead, i was forced to go back to my PC laptop and try recreating some of the files that were made by mac only applications into something similar on windows. i was unable to recover the web design files as they were on the macbook and i couldnt remember right off which folder it was in. So i had to scrape together things to be able to submit for my finals so i wouldnt totally bomb the course. My web design instructor understood how frustrated I got from losing all that work and having to settle for a final design that just met the requirments rather than the one on the mac that was well past it.
He is not sure whats going on as the last time he ordered a logic board for the same model, he had it by the end of business the next day. He is apoligizing for everything . I am not frustrated with him, rather I am frustrated with Apple as they had recommended me to take it in ASAP, yet they are seemingly dragging thier feet on getting him the parts.
On top of this, I am helping a neighbor modernize her business website, and am doing a project with the state unemployement office to help them redo thier videos. Both of these are things i would always use my mac for as it is like 5x faster than my pc on this stuff. It's more than just an inconvience now. I need my mac badly as the PC is just not fast enough to do what i need in the itme i am given (which i why i switched to mac as my primary computer).
Is this common for Apple when it comes to logic board replacements for macbook pros or what?
Has anyone else had this issue?

Applecare was no help at all. I called and did the complaint. They confirmed that it is registered to me and everything but essetially told me that they cant give me answers as to what is taking so long. They knew a repair was in progress but wanted to set me up with an appointment at an apple store? (the nearest Apple retail store is Billings which is 240 miles away, or about 4 hours). i tell them its at the repair place and they go on to tell me they can send me a box to mail it in and have it reapir by them.. They are trying to shift the blame to the AASP and his rep. But he said he has been trying with very few answers from Apple as well

1Ghz TiBook - Random freezing. Logic board fault?

Hi all,
perhaps one of you might be able to help troubleshoot this, because it's seriously driving me up the wall! I bought a used 1Ghz Titanium (DVI) recently and I'm finding that it freezes randomly when in use, requiring a comand+control restart. I've almost always experienced it in Safari, but also once in Entourage, illustrator and also in MacOS 9.2.2 Finder. Essentially what happens is that the cursor freezes and the powerbook no longer responds to keystrokes or trackpad input. I've tried an external mouse but that doesn't fix things either. The display is still lit but any moving graphics/video are frozen on screen. If music is playing in iTunes it cuts out leaving the last second of sound looping. Shortly after freezing I sometimes hear the fan come on, so perhaps there is a part of the powerbook still working after the crash (?). Also, I can select/deselect the caps lock and number lock keys and the green LEDs switch on and off, so perhaps it's not completely dead? The moment of the freeze almost always coincides with a mouse/trackpad click on the scroll bar, menu, safari menu bar, dock icon, form submit button, etc. It will on occasion freeze overnight when there is no mousing at all. generally though I can leave it playing iTunes all night and when I start using it in the morning it'll freeze when I collect my email or something.
the frequency of the freezing is semi-random; I have gone for roughly 48hrs of constant use without incident and then suddenly 2-4 crashes in short succession (ie, within about 10 mins of each other). Generally it freezes about 2 or 3 times a day. They do often come regular clumps.
Initially I thought it was Safari, or the OSX 10.4.5 installation that came with the powerbook, but I removed the entire HD and replaced it with the working drive from my Pismo and had exactly the same symptoms. Realising it was hardware related I did the usual drill of swapping, re-seating and removing ram, etc - but no dice. I've run Apple Hardware Test in a couple of 18hr loops but they return a glowing report about my hardware! techtool does likewise. I took it to the new Apple Centre in London where they ran their (apparently more powerful) AHT CD for 73 loops over 3 hours. Again, no reported errors!
I've read the long 'trackpad cable thread', and opened my powerbook to see if pinching the cable is an issue, but it's clearly not. I have lots of clearance around my trackpad cable and it's not in contact with any part of the case. I've even applied pressure all around the palmrest and the outside of my powerbook case hoping to induce a freeze but that doesn't seem to do anything.
What should I do next? when the powerbook works it's fine, but I'm at a loss as to what's causing the freezing. As a performing musician playing to hundreds of people a fault like this renders my powerbook useless since it must be absolutely stable and bullet-proof on stage.
thanks for reading and I'm grateful for any advice.
TiBook 1Ghz (DVI) Mac OS X (10.3.9) 9600/350

hi there,
thanks for the welcome. i've been visiting here for a while and find all the posts very useful.
the trackpad issue is an odd one; my powerbook doesn't seem to show the classic symptoms of weird startup chimes or jerky cursor movement, etc in the other thread. I nonetheless opened up the powerbook praying that I'd find a pinched cable since that would have been so easy to fix. unfortunately there's nothing about it that looks problematic.
I had also suspected heat as being an issue and searched this forum a couple of times for related posts, but couldn't find anything. When I opened the powerbook i checked the fans for obstructions and blew out any dust i could see (i didn't have compressed gas). Again, they looked fairly normal to me - i didn't spot anything obvious like a trapped cable. As far as I can tell all 3 fans come on OK. First one of them and then after some time another one or two turn on after the powerbook has been running a while. (Is it actually possible to determine whether or not they're all working?)
It's difficult to say whether heat is actually related to the freezing. certainly I often notice the fans come on before a freeze, or right afterwards, but just as many times that's not the case. what is consistant however is that the freeze occurs the instance a cursor selection is clicked.
would you say this would be resolved by a logic board swap, because I know someone selling one. On the other hand, I'm a little confused by all the error-free reports I get when I run the Apple Hardware Test for extened loops.
thanks again for your help!

Power Mac G5 DP1.8GHz - Bad Logic Board or Power Management Issue?

I have a Power Mac G5 DP1.8GHz/1.5GB/80GB which I bought non-working. It has not yet been disassembled or examined by a certified tech. This is it's issue (which replicates): the computer powers on. It makes a single warning tone, then the LED flashed at least 15 times (too fast to count). Then the posting chord is heard. Hard drive spins up. Then nothing (no video). Won’t boot from any disk. I have changed the RAM and tested the RAM banks with known-to-be-good RAM from another DP1.8GHz G5. The warning tone stopped once or twice after this switch, but then it didn’t chime. I changed the PRAM battery, but not with as new one. However, after installing the used one and then resetting the PMU, it displayed video briefly for the first time. While installed in the other 1.8GHz G5, the hard drive was formatted, given a clean install of OS X 10.4.11, and then moved into this computer where is never mounts. The computer is not accessible through TDM.
Do I have a bad logic board? Bad CPUs? A power managment issue? A RAM issue?

Through my own trial and error troubleshooting, I have found the CPUs to be in good working order and the logic board passes the Apple Service Diagnostic every time. Despite the installation of numerous pairs of modules that worked in another DP1.8GHz, the computer has a RAM issue-it gives the "no good RAM" tone most of the time when it powers up (after a PMU reset it does not). Also the computer boots from disk or into Open Firmware but the disk utility can't see either hard drive so I may have a bad SATA controller.

Power Mac G5 Dual 1.8 Problems / Failed Logic Board?

Okay, it seems that many other people are having problems with the Power Mac G5. All I can really say to Apple is that I love Macintosh and the Power Mac G5 has been the greatest computer I have ever owned. It seems that the logic board is the main issue for most people. Maybe Apple still needs to work out some bugs, but one thing for sure is that it would really be nice if there were no more produced like this and that everyone gets their problems solved without going through it again.
Well, my G5 stopped working about a month ago. I've been really lonely and sad too... It started that the computer would randomly start, meaning that I would have to power it up and down several times until it randomly start. Other people have had these issues too. And after about 2 days of doing this it froze and now it refuses to start. I've done everything I possibly can without being a technician. I have two video cards and switching them dosen't help, my monitor works, and when I take out the ram there's no beeping. No power to keyboard or mouse, can't reset firmware, or reinstall OS or run hardware test. I reset PMU, but still no luck. I've tested both my Superdrive and Hard Drive. They both work. I have a friend with a G5 and I put my Hard Drive in and it booted up perfectly.
Fans are functional, they speed up after about five minutes with no chime at start up. Which the chime is supposed to indicate a hardware failure. My only clues are the logic board and the processors, possibly the power board. Though it seems to be the logic board most of the time. The big thing is, does Apple know what's causing this to happen to Apple fans and costumers?
I saw an earlier post with a guy who bought the same G5 a year and a half ago with three year warranty and had the logic board replaced-three times already!!!
Unfortunately my G5 is out of warranty. I bought it from CompUSA and someone had boughten it and decided to return, unused still. They gave me a the 3-year warranty extension program, but I could never activate it. I've had the computer about a year and a half myself. I bought it early June last year June 2004. But this was right before the new line-up came out. So it's the November 2003 model. It's ecspecially depressing that a week or two later I could of gotten it for $500 dollars cheaper and a newer model. Not to also mention the beautiful new Apple Cinema Displays that match the G5. Though I doubt that Apple with have any sympathy for me for not waiting a little longer. I love my G5 and I just want to hear the chime and watch my 20" Apple ADC Display turn on. I don't live anywhere close the any Apple Stores to take it in for diagnostics.
So I'm really in a tunnel of doom. I'm thinking of buying the logic board from mac-pro.com for $700. I heard Apple wants a $1000, but I don't know. Though driving it in to the Apple store isn't gonna be easy for me. Even so, I'm afraid of how costly it will be. I need to know what's defective and needs replacement more than anything. I only wish there was some way I could activate my 3-year warranty extension program. Well, I suppose that's really enough of my pitiful crying.
Does Apple or anyone care to help me? I would be forever so happy if I could get my G5 working again. Thanks to anyone who'll attempt to help. You too Apple.

Hey Everyone -
Have you looked into the iMac G5 repair exstension Program for video and power issues? Posted on Apples website....The iMac G5 repair extension program for video and power issues applies to the first generation G5 computers that have video or power-related issues as a result of specific component failure. If your iMac G5 is exhibiting any of following symptoms: scrambled or discorted video, no video, no power, your computer may be leigible for repair, free of charge. This article was posted on October 21, 2005.
My computer was freezing up, not booting up, locking on the blue page, static looking when trying to boot up, etc. I took it in to the Apple Store yesterday, and they will be replacing the board within the next 2 weeks. Although my have an extended warrenty, the replacement program is avaliable for certain first generation iMac G5 models that were sold between approximatrely September 2004 and June 2005 freaturing 17- and 20-inch displays with 1.6GHz and 1.8Ghz processors.
If Apple or an Apple Authorized Service Provider determines that your iMac G5 computer is eligible as part of the program, the repair will be covered by Apple for up to two years from the original date of purchase even if your iMac G5 is out of warrenty. This is a worldwide Apple program.
It's worth looking up the article, it list the serial number ranges that apply. Worth a look!

IMac G5 won't start up - logic board or power supply?

My oldest son killed my iMac G5. Apparently he'd taken to sneaking downstairs in the middle of the night and watching videos on YouTube. One night, during his viewing session, the iMac threw up a kernel panic and the fan came on. My son tried to turn off the iMac but couldn't find the switch. So *he went to bed and left the iMac with the fan on full-blast.* When I came downstairs to go to work, 6 hours later, I turned off the machine, waited for a minute or so, and then attempted to turn it on.
The iMac is stone dead. Will not turn on.
I'm deathly afraid the logic board is cooked. Those things are damned expensive. I held off on doing anything for a while, but then I was talking offhand with a Genius at a local Apple store. He said it might be as simple as a power supply. Which would be great - $125 is a lot cheaper than $800, and I could do this repair myself. But I don't want to sink $125 into the machine unless I have a pretty good idea that this will, in fact, fix it.
Anyone else had this problem? Did it turn out to be the logic board, or the power supply, or something else entirely?

First off, the kid is grounded - second, which model do you have? Have you tried resetting the SMU? Resetting the SMU can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so on. If your computer still exhibits these types of issues even after you've restarted the computer, try resetting the SMU. To reset the SMU on one of these iMacs:
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
Let us know if this helps,

Is replacing the logic board going to make my early 2011 Macbook Pro as good as before

I have an early 2011 15" Macbook Pro that just crashed completely days ago. I sent it to the genius bar and was told that I need to replace the logic board and it costs amost $1000. I'm thinking whether changing the logic board actually means that my macbook would be as good as before. I mean I'm not having high expectations but I hope that it would at least lasts for another few years. I've only had this Mac for three years and I'm not sure if its a consistent problem for the early 2011 models regarding the logic board but I sure had mine replaced for at least three times in the first year when I got it. I'm not sure if I should just use that same money to get a brand new laptop, problem is, I'm quite unwilling to switching to a windows system if you understand how it feels.

The first thing I'd look at is your hard drive ... is your free space 10% to 15% or more of the total capacity? If not, that would account for what you're seeing.
See this for other considerations: http://www.thexlab.com/faqs/performance.html

Would apple replace a logic board for iPhone 5 if still under warranty?

There has been a logic board failure within the iPhone 5, no water damage to it just switched off and never came back on. Once happened to my iPod Touch and i just got a new one (happened within a month of me buying it and i bought it in HMV)
The warranty ends in December, so will Apple fix it/replace it for free?

sylly909 wrote:
is it possible for it to not be a manufacturing-related defect?
Apple will have to examine the iPhone to determine the cause of failure...as long as it is not due to user inflicted damage, then it should be covered.

Does anyone know what the second button is for on the logic board of an iMac G5 (PPC), 1st generation ?

One button on the logic board of a 1st generation iMac G5 (PPC) is an alternate power button. Does anyone know what the purpose of the other button is?

I am far from certain but I believe it is the power management unit (PMU) reset switch a/k/a Cuda switch: http://support.apple.com/kb/HT1939
Do not press it when the computer is on.

Will Apple do a Logic Board Replacement?

I have a 2.16 C2D Merom Blackbook. Because of the way Leopard hogs ram, the original 2GB capacity (I currently have 1) may not be enough soon. I am going to switch to the Blackbook from a 4 year old PC as my main machine in 6 or 8 monts.
My question is: does anyone know if Apple will replace the logic board in my Macbook with a new one with Santa Rosa and a 2.6 C2D for the regular fee as it just bit the dust (I am assuming the processor is permanently attached to the logic board, otherwise I would keep the current 2.16 C2D? I am guessing it would be >$300, but it would probably be worth it to get a Santa Rosa logic board, 4 gigs of corsair ram and a 250GB hard drive.
Also, does anyone know if the pre Santa Rosa Macbook will support 3GB of ram, as the chipset supposedly supports it, even though it would break the dual-channelness?
EDIT: Forgot to say its Parallels that is the real memory drain that could drive me to need 4 gigs of ram. MacOSX, Windows XP and Ubuntu at the same time would be sweeeeet!
Message was edited by: BiggAW

BiggAW wrote:
My question is: does anyone know if Apple will replace the logic board in my Macbook with a new one with Santa Rosa and a 2.6 C2D for the regular fee as it just bit the dust (I am assuming the processor is permanently attached to the logic board, otherwise I would keep the current 2.16 C2D? I am guessing it would be >$300, but it would probably be worth it to get a Santa Rosa logic board, 4 gigs of corsair ram and a 250GB hard drive.
Only Apple can tell you that.
Also, does anyone know if the pre Santa Rosa Macbook will support 3GB of ram, as the chipset supposedly supports it, even though it would break the dual-channelness?
They support 4 GB the regular c2d could use 3gb and the original cd 2 gb.

Switching logic boards

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