Question about downgrading from Snow Leopard to Leopard

After many problems with Snow Leopard (unable to print, programs crashing, dissatisfaction with the new Preview, etc., etc.), I have decided to go back to plain old Leopard for the time being. I was perfectly happy with version 10.5.8 and had no problems whatsoever with it. I'm a freelancer and need my system to be working right. Maybe someday, I'll upgrade to Snow Leopard, but not for a while.
I plan on using Time Machine to restore my old system. The only problem is that I forgot the day I did the upgrade. I think it was either last Thursday or Friday, but I'm not sure.
Is there a way that I can see exactly when I did the upgrade so that I can be sure to restore from my latest backup?
Thanks for any advice.

You will need to boot from your Leopard installer DVD and do an Erase and Install. You cannot reliably downgrade any other way. As for restoring from TM all you really need do is post installation use Migration Assistant which will then restore your Home folder, third-party applications, support files, network preferences from your TM backup (or any other backup.) Just be sure that during the Setup Assistant you create the initial admin account using a different user (short) name than the one you normally use. Migration Assistant will restore a Home folder, but it will not overwrite nor update an existing Home folder with the same username. After you migrate the account and restart the computer, log into your old account. Verify it has admin status, change auto-login to the account, then restart to be sure all is working correctly. If so then delete the initial account created during setup.

Similar Messages

Downgrading from Snow Leopard back to leopard?

IVE HAD IT!! lol. This operating system has sooo many flaws so far. Is it possible to downgrade back to leopard from snow leopard?

If you do an erase and install, then, yes, you will have to reinstall everything with two major exceptions. If you make a bootable clone of your Sno install on an external drive, then you can migrate your user, settings, data, and apps from the clone. However, it looks like you have a troubled Sno install. So, I think you would be asking for trouble is you migrate anything but your data. Still, you might take a chance on migrating your apps. I might try if reinstalling them would be a huge undertaking. Essentially the same comments apply if you have a TM backup, although sometimes TM won't restore from a backup made under one system to a different system. I wouldn't take a chance on using TM under the circumstances.

Downgrading from Snow Leopard to Leopard 10.56. Possible?

Will it be possible to return to Leopard? I want to use 10.56. I didn't have any problems with it. Photoshop CS 1 worked fine on it. On Snow Leopard I have problems with "Move a layer" with Snow Leopard (even with Rosetta installed). Also, MS Word doesn't work that well. It takes forever to save and I can't copy and paste word files from MS Word to Pages. Other strange things. It started getting really slow to shut down and slow to boot. It's OK now but that's because of the fresh install, and I haven't updated to 10.63. I am scared to do that now. The only good thing was the extra gigabytes and Safari 4, but I don't use Safari much anyway, Opera is so fast.
And lots of whirling balls of death before I did the clean install.
I don't think the upgrade works very well - from Leopard to Snow Leopard, best to do a clean install.
However, I want to go back to Leopard as I didn't have any problems with it except maybe I couldn't get the latest upgrades of certain programs and I lost about 5GBs of space on my hard drive compared to Snow Leopard.
Also, Bootcamp doesn't work as well. I can't get the network to operate on Windows XP. On Leopard, it transferred seamlessly without having to adjust the control panel or anything. Now, my only choice is unsecured wireless network. I don't want financial data to be unsecured when doing internet banking or purchasing with a credit card.
What is the point of Snow Leopard? Seems like Apple's aware of problems with it but no solutions are coming. Life is too short to worry about Update beta, update combo or whatever. Or whether 6.2 is btter than 6.1 etc.
How do I go about doing the clean install?
Will there be any problems because I will be transferring files like Safari which have a higher version than Leopard can handle? What should I do in that case? Will the lower version of applications install automatically?
I don't know how it will work out. I've never downgraded the operating system before. It's always been up.
Will it be OK or will I have to do a lot of fiddling around afterwards? Because I'm not good at that.
Thanks.
One last question: Should I do a clean install or just stick the disk in and do an install?
Will the second one wipe the data off my machine?

Thanks. What I meant by downgrade is: is it possible to put OS 10.56 on my computer and put all the same files on it (later)? I think the answer is yes but I have to do a clean install.
I will have to use Migration Assistant on my MBA.

Question about changing a Snow Leopard Server network settings

We have an Xserve running Mac OS X Server 10.6.8, the primary services running on it are afp, smb, dhcp, dns, jabber and the calendar sever.
Right now we have a router connecting two networks together, 192.168.0.0/24 and 192.168.1.0/24. The Xserve has a static IP address in the 192.168.0.0/24 range.
In order to combine two phone systems into one I am required to combine the above networks, this will involve removing the router and changing the subnet mask on every device from 255.255.255.0 to 255.255.254.0, any device that is currently part of the 192.168.1.0/24 network will also need to have it's router setting changed from 192.168.1.1 to 192.168.0.1. That part should all be easy.
However, this is my first experience expanding a network past a standard class C and am wondering if there is anything I need to watch for on my Snow Leopard Sever.
Specifically I wonder about dhcp settings, right now there are two dhcp servers, the Xserve which provides dhcp for 192.168.0.0/24 and the router that provides dhcp for 192.168.1.0/24. Once the router is removed the Xserve will need to provide dhcp for the entire network.
Looking at the Xserve dhcp configuration right now I have one subnet defined providing addresses 192.168.0.5 to 192.168.0.125.
Can I simply click the + to add another subnet and add for instance a range of 192.168.1.5 to 192.168.1.125?
Will it simply give out all of the ip addresses in the first range and then start with the 2nd? Or do I need to find a single range of ip addresses large enough to meet my needs? (e.g. 192.168.1.5 to 192.168.1.225 or something).
Is there anythign else to watch for after making this type of network setting change?
Thanks in advance.

Thank you for your very detailed reply.
I understand the problems that can arise using 192.168.0.x and 192.168.1.x and if this were a new project I would definitely switch to something else, however in this case we have been using these ip ranges for years (they were in use here long before I started) and I don't want to have to redo all of my dns settings at the same time I make these other changes so I'm going to stick with the same ip's we are using at least for now. Anyone here needing vpn access has already dealt with this issue but we have very few vpn users so it has not been a major problem for us to date.
My biggest question is about increasing the size of the dhcp pool. For instance, after I change all the network settings and set up a /23 network is it possible to have a single dhcp pool that includes some ip's in the 192.168.0.x range and others in the 192.168.1.x range? I guess what I am asking is when I am in Server Admin and click on DHCP one of the tabs across the top is "Subnets". Right now there is a single "subnet" configured that provides addresses from 192.168.0.5 to 192.168.0.125.
Ideally I would like one dhcp pool that provides ip's in the range of 192.168.0.5 to 192.168.0.125 and then if all of those are used up, moves to 192.168.1.5 to 192.168.1.125. Can I do that by simply adding another "Subnet" so there are two? Or do I have to find one larger single range? (e.g. 192.168.1.5 to 192.168.1.225?) You may have already answered this indicating I have to have a single larger range but I just want to be sure.
The parts about changing subnet masks, and routers and all that I think I have a pretty good understanding of.
Your last paragraph is something I have been worried about, I do have a feeling that after making this change there will probably be unforseen issues that will need to be resolved, I'm just hoping it is not too many. For the scope of this thread I will just focus on issues that may arise with the Snow Leopard Server however.
Again, thank you for your help.

Downgrading from Snow Leopard to Leopard: Best Practices?

Hey everyone. Snow Leopard isn't working out for me (slowness, crashing, etc.), so I plan on downgrading back to Leopard for the foreseeable future via a clean install.
I utilize Time Machine with an external hard drive, within contains all of my files/documents/music for two user accounts. When I downgrade to Leopard, can I simply restore these accounts/files using migration assistant? Or am I going to have a problem restoring Snow Leopard backups to Leopard?
Finally, is this the best way to go about this process, or is there a better way?

Snow Leopard is simply running like crap. Everything is slower. Crashes occur. Neither of which was the case with Leopard. I think it is safe to say that my problems are manifestations of Snow Leopard, not OS X (or Leopard) in general.
Snow Leopard as a whole should not cause such issues. It is obvious you have some contributing factor that would be much easier to isolate than backtracking to 10.5, unless of course you have a clone or Time Machine backup of your system when it was in 10.5.
How big is your hard drive, and how full is it? If there is less than 15% + 9 GB free, you need to free up space based on past user experience. See my FAQ*:
http://www.macmaps.com/diskfull.html
Sometimes old fonts can cause problems:
http://www.jklstudios.com/misc/osxfonts.html
If you migrated from a PowerPC Mac in the past, you may need to remigrate without the Migration Assistant in the future:
http://discussions.apple.com/thread.jspa?threadID=435350&tstart=0
As it can bring over a lot of old applications and drivers that don't work with Snow Leopard.
Do you have any peripherals that are not known to be 10.6 compatible? See my upgrade FAQ above for references to utilities or applications that are not yet 10.6 compatible. If they aren't listed in those references, chances are they either are not compatible or may be more compatible if they are enabled/disabled to run in 64 bit, or Rosetta mode.
To change the 64 bit or Rosetta mode in your application, click on it once in the Finder, and select Get Info. A checkbox should reveal whether or not it can run in a different mode if it is available.
By default Snow Leopard is in 32 bit mode as an operating system. You may be able to enable 64 bit operating system if all your applications can run with it, following one of these steps:
http://blogs.zdnet.com/Apple/?p=4716
This should speed you along if you have that option available.
Three options which for whatever reason appear to help people for unknown reasons:
zapping the PRAM
repairing the directory and permissions*
If none of those help, you may simply have a hardware issue with your machine that simply manifests itself more frequently with Snow Leopard. Sometimes these can be isolated with the hardware test. Other times, it may simply indicate you have a RAM issue. Every new operating system is more sensitive to out of spec RAM or marginal RAM*:
http://www.macmaps.com/badram.html
And while the hardware test may catch some bad RAM, it can't catch all.
- * Links to my pages may give me compensation.
Message was edited by: a brody

Legality when downgrading from snow leopard to leopard OS

Hello all,
I have been looking through the apple terms and conditions of their software and I am unable to find anything regarding downgrades of operating systems.
If I have purchased a Macbook Pro w/ snow Leopard installed from factory, Am I allowed to downgrade the Operating system to Leopard without purchasing a new copy of leopard. Lets say I borrowed the DVD from a friend.
Can I do this legally? Yes or No?
Whatever the answer is, I need undisputable proof quoted directly from the apple support website. Thank you all

FernandoR wrote:
Hello all,
I have been looking through the apple terms and conditions of their software and I am unable to find anything regarding downgrades of operating systems.
If I have purchased a Macbook Pro w/ snow Leopard installed from factory, Am I allowed to downgrade the Operating system to Leopard without purchasing a new copy of leopard. Lets say I borrowed the DVD from a friend.
Can I do this legally? Yes or No?
Whatever the answer is, I need undisputable proof quoted directly from the apple support website.
geez, do you maybe want a phone call directly from Steve Jobs?
it certainly won't be legal if you use a borrowed disk. a leopard license clearly and indisputably states that you can only install it on one computer.
*2. Permitted License Uses and Restrictions.*
*A. Single Use. This License allows you to install, use and run one (1) copy of the Apple Software on a single Apple-labeled computer at a time. You agree not to install, use or run the Apple Software on any non-Apple-*
*labeled computer, or to enable others to do so. This License does not allow the Apple Software to exist on more than one computer at a time, and you may not make the Apple Software available over a network where it could be used by multiple computers at the same time.*
but this is quite irrelevant because you won't be able to install it anyway as it won't run. you can't install an earlier OS than the one the computer came with as it lacks necessary hardware drivers for the newer computers.

Downgrade from Snow Leopard Server to SL (non-server)

Is that possible to downgrade from SL Server to SL without making a clean install ?
I've just bought a standard version of Lion and I can't install it...
Thanks

Hi
You can't install Lion Server (which is simply the Server App) without installing Lion anyway. What this means is you can install 'ordinary' Lion on your existing Snow Leopard Server and provided you don't download and launch the Server App your Snow Leopard Server won't really be a Server anymore. Leastways not with any usuable 10.6 Server Administration applications (Server Admin, WorkGroup Manager etc) that you can use as these are all deleted/removed when Lion is installed.
HTH?
Tony

Question about Apple's Snow Leopard Up-to-Date program

I just pre-ordered the 10.6 upgrade from Amazon for my older mini; my sister just bought a new MacBook Pro without 10.6. Can I (of course I can, but should I?) use my copy of 10.6 to upgrade her MacBook so she doesn't have to order the upgrade kit? The terms of the program says she's entitled to the upgrade.

So if I understand you guys correctly: even if I bought a new Mac recently and qualify for the Up-to-Date program, I don't automatically get a license for Snow Leopard; the $9.95 for the upgrade kit is not just for shipping and handling but also a license fee? Correct?

Can you downgrade from Snow Leopard to Leopard if MacBook Pro is shipped with SNL

I have recently purchased a MBP with 10.6.8 already installed but it came with no disks and i wish to fromat to get it truley cleaned up. I have my shop bought Leopard i pruchased for my Imac and my leopard disks that came with a later MB, when i insert the leopard disk when booted it reads ok hit the install button MBP reboots but just sits with white/blue screen and nothing happens. Tried rebooting and holding C still nothing happens apart from the MBP does not boot up but hangs. Tried pressing alt at boot up and the option to choose the disk appears I select it nothing happens yet the mouse no longer moves, it just sits there. The disk is fine as i used it to reformat a friends MB 1 hour before i attempted mine.
So if the MBP came with SNL already installed can you not roll back to leopard, or is there something I'm missing.
model: 15.4 MBP 2.8ghz core duo 500hdd 4gb ram etc...

Hi all
Ok so I went ot the local Apple shop and they have stopped stocking SNL but advised i can download Lion and install and even though it didn't format i could when installed boot to the recovery partion -utilities and erase from there and then do a full install thus allowing a full format.
So erase done click install lion and it connected to the net and then sat for some time so what i'm asking is does this now have to down load the 4gb image again. I assumed it installed from the partition but will it download and install if so this could take some time as the Lion download took approx 8 hours.
Please tell me that is not the case as that is seriously flawed and left me in a dodgy position as i have erased my hdd and will have to wait till i can get a day off to run the next install.
as a foot note i was advised to copy the image and then burn so i would have a hard copy i did this would it be quicker to do it from thi disc.
thanks in advance

Help (please) w/ Full System Restore after downgrading from Snow to Leopard

Yes. I should have created a separate partition, cloned the drive, etc…. But everything was working so well I figured an upgrade to SL would make things amazing. Wrong.
So I downgraded from Snow Leopard to Leopard, using a clean Erase and Install from the OSX DVD that came with my Mac. Told by an AppleCare techie that I could restore my system from a Time Machine BackUp, I was confident that when the install successfully completed I would be able to restore from the TM Backup I made PRIOR TO installing Snow Leopard.
However, the 'restore system from time machine…' option that came up at the end of the Leopard installation told me I only have one TM backup, the latest one made under Snow Leopard (which obviously cannot be used to restore a system now running on Leopard.
When I log into the OS, I can open TM and choose the last 10.5 (Leopard) backup I made, but it seems to only let me restore the 'Macintosh HD' as a folder. So here is where I am stuck:
How can I restore my system - now on a clean install of Leopard - to the last TM backup I made under the selfsame OS. {Sorry if this is a simpleton question - I just really do not want to ** anything up}.

.adamo wrote:
Thanks, Pondini -
Good to know the AppleCare rep. I talked to (apparently) knew nothing about time machine or how to restore a system from it. I was given nothing but wrong and bad advice…
Yeah, unfortunately that seems to happen on occasion. They don't seem to have access to decent info on things they don't understand, or just "wing it" or something.
Anyway, the erase and install happened, so at least my system is 'fresh'. I booted from the OSX DVD, went into the Utilities menu, found the TM Back-up I wanted, et voila. But it seems I could have bypassed the whole erase/install thing and just restored with the BackUp from TM.
So I must say, to Apple's credit, that TM works extremely well, and exactly as described; couldn't have been more painless (not what I'm used to with computers, at all).
That's why you got a Mac! (They're certainly not perfect, but they're pretty good!).
Glad it's sorted out, and thanks for the star!

Upgrade from Snow Leopard?

Adobe through a monkey wrench into my plans to sit comfortably with OSX 10.6.8 and not rock the boat with something that works. I'm a Creative Cloud member and utilize many of the CC apps including After Effects. The new After Effects CC now requires OSX minimum of 10.7.4. Lion).
I've been reading many of the comments about upgrading from Snow Leopard and am now quite uneasy about attempting it due to all the conflicting remarks about it. I do have AE CS6 and can operate on it for a while, but the new features in AE CC are not offered as updates to CS6 programs.
Questions:
Is there an automated approach to determine if my current NON APPLE applications will work with either Lion OR Mountain Lion ?
I have NO power pc applications
I do not use Boot camp, parallels or anything similar. Windows software does not exist on this machine.
I do use MS Office for Mac 2011, including Outlook.
I assume that Apple is probably working on the next OSX incarnation to succeed Mountain lion and that It may be timed to be coincident with the new Mac Pro release which is a hazy mirage of "sometime later this year". Point being, is it worth it to wait until that future incarnation settles down with the inevitable bugs blown off?
Any help would be appreciated,
Ken

kenackr wrote:
Adobe through a monkey wrench into my plans to sit comfortably with OSX 10.6.8 and not rock the boat with something that works. I'm a Creative Cloud member and utilize many of the CC apps including After Effects. The new After Effects CC now requires OSX minimum of 10.7.4. Lion).
It's B.S. like this that is forcing me to switch to Windows 7 which remain as is and get updates until 2020.
On a good monitor, Win 7 doesn't look nearly as bad as OS X, longevity and stability is key asset, I can always restore from System Restore Images if it gets seriously hosed, else System Restore reverts back to the last updated state.
Since it's expected that by 2015 tablets will outsell traditional computers in the consumer space, doesn't bode to well for many Mac's which chiefly target the consumer market and the professional market to a lesser degree.
Apple has already discontinued the MacBooks and the 17" MacBook Pro, so it might be shortly that only PC laptops will be the choice of professionals for their more versatility than consumer tablets.
Anyway the future isn't looking too bright.
I've been reading many of the comments about upgrading from Snow Leopard and am now quite uneasy about attempting it due to all the conflicting remarks about it. I do have AE CS6 and can operate on it for a while, but the new features in AE CC are not offered as updates to CS6 programs.
A professional setup is a whole different animal than a consumer machine where they can care less as it won't cost them money if the machine is down for some time.
It's likely best you buy a new MacPro and ease into it rather than take your chances on the Lions because they take some getting used to their strangeness.
I advise you also to join the chorus and complain on the Adobe forums about what they are doing to force upgrade you for their purposes.
Slightly over 25% of OS X version market share is on Snow Leopard and many of them because they are running PPC based apps they can't get anymore.
So I'm assuming there will be quite a uproar on the Adboe forums over this, or else you can be the first to kick it off.
Adobe is trying to push, but if enough people push back and start to look for alternatives, Adobe will have to cave in because their sales are down big time as the print media industry is dying, thus less need for artists and the CS suite.
Is there an automated approach to determine if my current NON APPLE applications will work with either Lion OR Mountain Lion ?
I have NO power pc applications
I do not use Boot camp, parallels or anything similar. Windows software does not exist on this machine.
I do use MS Office for Mac 2011, including Outlook.
Not automated, but user submitted information here.
http://roaringapps.com/apps:table
I assume that Apple is probably working on the next OSX incarnation to succeed Mountain lion and that It may be timed to be coincident with the new Mac Pro release which is a hazy mirage of "sometime later this year". Point being, is it worth it to wait until that future incarnation settles down with the inevitable bugs blown off?
I would if your planning on buying a new MacPro.
Don't kill your present money making machine with the Lions, it's just not worth it.
Now you CAN clone your present boot drive to a external powered drive, option/alt boot from it and upgrade that to the Lions to get you by until the new MacPro is released and you can get fully up on that.
Most people need Snow Leopard for some reason or another, installing it on a paritition or via a virtual machine is a bit of a pain.
Snow Leopard is really fast, the Lions are fully 64bit and act more like dump trucks, RAM gobblers 4-8GB+ and a SSD on a newer issue Early 2011+ laptop or 2010+ iMac/Mac Pro is better suited for them.
I think the new MacPro + Mavericks is the way to go, keep the Snow Leopard machine working while the bugs and Adboe issues are worked out, then of course is the new OS XI version coming after that is the more pernament solution for longterm.
Most commonly used backup methods
Plan your moves carefully, don't let the arses at Adobe push you off a perfectly working machine into a OS X upgrade that can fail horribly and brick your logicboard/firmware with no AppleCare coverage to fall back onto.
I had 10.7 kill a 2007 MacBook Pro I upgraded from 10.6, it was 4 years old and Apple wouldn't fix it.
So don't upgrade OS X out of AppleCare unless it's a spare machine, certainly not your working machine.

I want to downgrade to Snow Leopard from Lion

Hi
Can someone please tell me how I can downgrade from OSX Lion to Snow Leopard on my brand new 27" iMac.
I spoke to Apple over a week ago on the phone and explained that I wanted to downgrade to Snow Leopard and the chap I spoke to sold me the Snow Leopard upgrade disk and not the full installion DVD, I already own the Snow Leopard upgrade disk so now I have two copies and I can't use them to downgrade.
All I get when I insert the DVD is a message saying "you can't use this version of the application Install Mac Os X with this version of Mac OS X"...
Could someone please tell me exactly what Snow Leopard disks/ DVD I need to purchase (and where) for me to install Snow Leopard on my iMac. I have seen lots of different "versions" on eBay & Amazon with vastly differing prices but how do I know which disks I need to buy as I don't want to end up purchasing a third "Upgrade only" versionof Snow Leopard.
Thank you for any help you can give me with this...

I've already tried all of those methods using the 10.6.3 disks I bought, they simply don't work as I posted earlier.
All that happens is the machine constantly bleeps 3 times in a row and the DVD drive stops spinning. I know booting from a DVD install disk is a slow process but no matter how long I leave it nothing happens except for the 3 bleeping sounds.
Having scoured the net and spoken to Apple themselves all information tells me these 10.6.3 disks are actually for someone upgrading from Leopard to Snow Leopard.
I have no idea why Apple sold me this version as before I ordered it I explained fully to the sales person what I was wanting to do and they had all the details of this mid 2011 iMac I have bought. So unless the sales person didn't have a clue what they were talking about then I should be able to "downgrade" to Snow Leopard on this iMac as even the specs for this model clearly state on everymac.com that it originaly shipped with OS 10.6.6 (Snow Leapard)
http://www.everymac.com/ultimate-mac-comparison-chart/?compare=all-intel-macs&hi ghlight=0&prod1=iMacIntel041
So there must be somewhere I can purchase these 10.6.6 install disks to "downgrade". Trouble is on Ebay or Amazon where you can buy Snow Leopard most of them are 10.6.3 or "retail" versions with no actual version numbers to let me know I'm buying the correct disk.
Who would have thought setting up your computer could be a mission impossible task and why Apple don't help is simply a disgrace to be honest.

Can't find iPhoto photos after downgrading to Snow Leopard from Lion

I had my photos on my External Hard Drive being used as a backup for TIme Machine.
After downgrading to Snow Leopard from Lion (my computer was running rediculusly slow likely due to being so close to the minimum requirements), I can not access any of my Time Machine dates prior to the date I downgraded. I have reinstalled Lion to try to access the files that way, but am having issues finding my old photos.
Any help would be appreciated as I've got about 15000 photos of my kids on there.

There are issues with iphoto which changes versions..
I would strongly recommend you do an archive of the TC before you do any more playing.
I presume the TC is the only place you have these photos stored??? So your entire library is hard disk erase from total annilahation.. not good!!
Load a real utility into Lion.. archive is not present on the new version.. why apple why??
http://support.apple.com/kb/DL1482
You can then do a full restore to an external drive.. or something fancy..
Pondini is the saviour here.
http://pondini.org/TM/15.html
There is a specific section on iphoto and its pain.
I strongly suggest you read the entire section from Q14-18 so you actually understand what TM does.

Hi, having old macbook pro intending to upgrade my os from snow leopard to lion but negative reviews on lion just put me off..i have ms office and photo shop installed on my machine..my question is will upgrading to lion stop me using those application?

Hi, having old macbook pro intending to upgrade my os from snow leopard to lion but negative reviews on lion just put me off..i have ms office and photo shop installed on my machine..my question is will upgrading to lion stop me using those application? thank you.

htfromgrantown wrote:
Hi, having old macbook pro intending to upgrade my os from snow leopard to lion but negative reviews on lion just put me off..i have ms office and photo shop installed on my machine..my question is will upgrading to lion stop me using those application? thank you.
Negative reviews are common place here as it is a trouble shooting forum. If you want to read the advantages, improvements and new features then go to the Apple site. If you are running Word 2004, Early Adobe suite, etc which are PPC programs, then don't update. Go to Apple logo in upper left menu bar, open About this mac > More Info > Software >Applications and sort by 'Kind' and look what PPC programs you have installed. If you are not prepared to upgrade these programs, then do not update to Lion.
There are plenty of threads to read up on about this here. But remember that 99.9% of comments will be negative, even though the forums represent only a tiny fraction of the Millions of Lion Downloads purchased and installed with no issues at all. So basically it's your call.
Good Luck

Help Downgrade to Snow Leopard due to Constant Freezing from YouTube and Update Failures?

I love the new OSX Lion, however due to youtube being my most visited site, the widespread issue between new iMacs with Lion and Flash Player is bad enough that I would like to return to Snow Leopard. My computer has already frozen and needed to be restarted upwards of 15 times. If I no longer posses the Snow Leopard install disc (never thought I'd need it since I upgraded), is there any way for me to revert to Snow Leopard? I just can't stand the freezing, as well as how long it takes to restart following said crashes, it has rendered my mac nearly unusable. Also, when I run the Software update application, updates keep finishing downloading and then telling me that the download "Can not be saved" which forced me to move my music library to Spotify. Although after 3 days the iTunes update did finish however i did not want to go back to iTunes for fear of future problems. Help?

I've already tried all of those methods using the 10.6.3 disks I bought, they simply don't work as I posted earlier.
All that happens is the machine constantly bleeps 3 times in a row and the DVD drive stops spinning. I know booting from a DVD install disk is a slow process but no matter how long I leave it nothing happens except for the 3 bleeping sounds.
Having scoured the net and spoken to Apple themselves all information tells me these 10.6.3 disks are actually for someone upgrading from Leopard to Snow Leopard.
I have no idea why Apple sold me this version as before I ordered it I explained fully to the sales person what I was wanting to do and they had all the details of this mid 2011 iMac I have bought. So unless the sales person didn't have a clue what they were talking about then I should be able to "downgrade" to Snow Leopard on this iMac as even the specs for this model clearly state on everymac.com that it originaly shipped with OS 10.6.6 (Snow Leapard)
http://www.everymac.com/ultimate-mac-comparison-chart/?compare=all-intel-macs&hi ghlight=0&prod1=iMacIntel041
So there must be somewhere I can purchase these 10.6.6 install disks to "downgrade". Trouble is on Ebay or Amazon where you can buy Snow Leopard most of them are 10.6.3 or "retail" versions with no actual version numbers to let me know I'm buying the correct disk.
Who would have thought setting up your computer could be a mission impossible task and why Apple don't help is simply a disgrace to be honest.

Question about downgrading from Snow Leopard to Leopard

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