That is major surgery. The technicians will need to remove everything, and will likely access many files on your HD to verify functions (sound files, photos, large nmubers of applications, ...)
You are at grave risk of losing all data on your HD. But the good news is that saving your data can be easy.
I have used CarbonCopyClone to make a bit-by-bit copy of my startup disk. If my startup disk dies, I simply replace it and re-clone from that external self-powered HD back to the new disk.
Read this (https://discussions.apple.com/message/16276201#16276201) for "all you need to know about backups".
Post back when you have read, if you have other questions.
Your applications will still be intact. While replacing the logic board is a major procedure, the hardware is virtually identical to your current one so it should essentially be a drop-in replacement. The hard drive and OS configuration it contains should run seamlessly on the new hardware.
If you buy a new Mac, you should be able to boot directly to the old hard drive, but be sure you fully update the OS before you do this. Ensure you are running the latest version of the latest OS release before you update, as this will ensure the new hardware is supported on the old hard drive installation before you use it.
Not off topic ... this is *YOUR* post ...
To start, you can sell your old one for the parts that still work (SuperDrive, display, ...). Gives you some money back on a new one.
And PLEASE do not read my following statements as "just pay to fix it" ... I am just stating facts and I for one would probably buy new and sell old for parts
Second ... *most* new units come with Lion, and due to the firmware (PCs have BIOS on EPROMs, Machas "EFI Firmware), getting anthing less than Lion to run is tricky (just look up the number of existing posts on this subject). Some have successfully pulled it off, but it all sounds complicated and I like haing an SL-initial unit.
But do not despair ... some people have hoarded stocks of MBP that can easily run SL because they actually came initally with SL so gray install disks come free. If you start a post asking who knows these vendors, you should get an answer.
Also ... with apologies if you did not know this (as if you had no read anythingthing else I wrote) ...
Lion does not support PPC software anymore because Rosetta is not supported. Could be higher software replacement costs if you do not intensely look for one of the few SL-initial MBP.
If you want to and want to avoid Lion (I have no valid opinion on why you should ... just saying if you want to) then start a thread on "Who knows the venors of existing pre-Lion MBP?".
I only mention the Lion issue because even if you put your old HD into an external enclosure, Lion-ready systems may not boot off that old system with applications you already have installed, and you wold be reloading all apps anyway.
I will stop so you can catch up, and ask more.
Or just jump straight to my recommended post and ask your question about saving old HD and SL-ready MBPs.
I'm just stating what I understood... If I understood wrong please let me know.
If I take the hard drive out of my old MBP, it will not work in a new MBP or iMac, because I was thinking about getting an iMac, because the new Macs come out with Lion... Right?
And another question... btw sorry if my understanding is not at your level because I'm not that informed about Macs...
If I put my old HD into an external enclosure, am I able to put the apps in a new Mac and use them?
If not how can I make them work? Or am I just able to get the saved content like projects?
Sorry that I haven't answered back lately... work...
New hardware that came with Lion only runs Lion, yes.
Saved content like libraries, only, yes. Assuming the particular application supports "import", I do not know all of the applications you run, nor do I understand all of these applications. You would need to ask specifici questions about those applications in a new thread.
There is a tool called "setup assistant" that can import "user accounts" or other system-oriented elements, but I have never used it.
If you believe the logic board replacement is a bust, then you should probably take a new plan of attack.
A new thread ... "My logic board died, buying new mac, will make a CarbonCopyClone. How do I import libraries and old user accounts?".
Do not forget Lion is new world of "no install disk", "Recovery Partition", "No PPC applications run". Logic board replacement may be he better bet for now.
But Lion Setup Assistant is beyond my actual experience.
I hope this is not viewed as "abandoning".
Repost if I can help more.
ok I understood that replacing the logic board may be the better thing to do... Now to be more specific, will I lose my Logic Studio 8 application if I replace the logic board? Will I lose my Logic projects?
Don't want to be annoying but I'm looking at the options I have because I really don't want to lose my projects.
Simply put, your Applications and Projects are stored on the hard drive. You only have a problem if something happens to the hard drive.
Look at at it this way. If you replace the engine of a car, it usually does not affect what you have in the trunk...
If you get a new computer just use the migrating assistent and it will transfer a everything over to the new machine. Assuming the old computer still functions.
Otherwise simply use an external Hard Drive Enclosure with the hard drive from the old machine to access all your Applications and Projects...
By the way ... fixing an otherwise functional system that does not have the "Lion only" limit is not a bad idea, especially if the price is 1/2 of a new system.
If you think replacing the logic board is the best path for now, you can buy a new drive from macsales.com (a guide will ask the model and year of your unit and tell you good ones). Make it 2x as large as current drive. Either it will eventually serve as a backup drive for the current (and you will want it 2x as large) or ir will beconme your new primary drive and you may as well go for it.
Then give Geniuses the new drive and the Mac and say "do your worst with the new drive, but do kindly leave my machine able to run Leopard afterwards". Keep your old drive safe and sound with you, to be transferred after your system logic board works.
If logic board replacement is the path, protect the current data drive and focus on getting your system running.
THEN think about transferring data from the old drive.