How to boot from install disc and do a clean install

No one tells you that you can't restore a TM backup that was done on Mountain Lion 10.8.2 to a new hard drive with Snow Leopard. After many hours with Apple Care yesterday, they were foxed.
I want to now do a clean install on my new hard drive (installed yesterday by an Apple Care serviceman) using my Snow Leopard install discs (10.6.3). How can I do this?
After I have done a clean install, I will set up the iMac and upgrade to Snow Leopard 10.8, which will give me the App Store, where I can upgrade to Mountain Lion and then attempt the restore from Time Machine.
I am just uncertain how to do a clean install.

Would you find a way to tweet or post the following info so that other iMac users who need their SeaGate HD replaced don't go through hours of headache before they get this information?
RE: iMac HD replacement.
If your TM backup is on Mountain Lion and your startup discs are Snow Leopard (or earlier) do NOT restore your backup after new HD is installed!
First, update OS to Snow Leopard 10.8. This will install the App Store. Note: it will take about 20 hours.
When you have the App Store in the dock, install Mountain Lion. Note: again, about 20 hours.
After ML is installed, restart holding down the option key. Select restore from TM backup and select your data.
I was told by Apple Care that ML makes changes to the HD, thus installing a backup to a previous OS will not function properly.
You can create a bootable backup of ML to a flash drive or DVD when you buy it. Good idea as Apple is not making install discs now for new OS versions.

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2006 iMac running 10.4 OS. I copied files to ext. drive. Put in 10.6 disc and did a clean install (format) of 10.6. Copied data from ext. drive back to Mac. I didn't get all the files. CAN I REVERT BACK TO THE 10.4 OS SO I CAN COPY MY DATA PROPERLY?

How did you copy files to the external drive, and what files did you copy? Did you drag and drop in the Finder? Use a clone utility? What files did not successfully copy?
If you reformatted the drive as part of your install, then you won't be able to recover any files from the drive. Reverting back to (reinstalling) 10.4 will not help you.
Do you have a complete-drive backup of your old system?
Matt

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If you have Yosemite installed and want to reinstall it, do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Reformat the drive using Disk Utility/Erase Mac OS Extended (Journaled), then click the Option button and select GUID. Then re-install the OS.
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K7N2G-ILSR: How to boot from SATA when a raid card is installed

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2. I have another drive (my boot drive) that I want to place on the onboard Promise SATA raid controller.
The problem:
The bios doesn't include an option to specifically boot from SATA, only SCSI. So when I place my boot drive to the onboard Promise SATA raid controller, the system won't boot because it's looking for system files on the raid 0 drive.
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Well, all my drives are IDE. I did try the SATA RAID using lumberjacker's bios but it isn't stable.
Aside from 3 IDE drives, I also have 2 atapi drives (cdr-w, dvd).
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ide 0 - boot drive (master), DVD (slave)
ide 1 - cdr-w (master)
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SATA 2 - (vacant)
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How save factory software on T400 and reinstall after clean install of Windows 7

Hi
I have a Thinkpad T400 2764-CTO Running Vista Business 32-bit and want to do a clean install to Windows 7 Pro.
Sounds like I can get all the drivers via System Update 4.0, but I'm concerned about how to save/re-install some of the software that came on the machine.
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Please review the HP software and driver download page for drivers/software that are compatible with Windows 7. Also note that there is a BIOS update for Windows Vista that improves the system's ability to function with WIndows 7. Also read "Alerts" and other information regarding this product and Windows 7.
Frank
Frank
{------------ Please click the "White Kudos" Thumbs Up to say THANKS for helping.
Please click the "Accept As Solution" on my post, if my assistance has solved your issue. ------------V
This is a user supported forum. I am a volunteer and I don't work for HP.
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Won't boot from installation disc

I'd like to reinstall Tiger. The installation disc mounts on the desktop and opens. I click on the install icon to restart the computer and boot from the disc and the computer crashes. I have two Tiger installation discs, crashes using either one. I tried it with a Panther installation disc but same thing--crashes. I've tried booting by holding down the C key--crashes. The drive burns successfully and reads successfully. There was no hint of a problem before this.
thoughts anyone
mark

Hi-
If the proper version of the OS software, have you disconnected any third party peripherals, especially USB devices?
Could also try a Single user boot (command + s on startup) , and run fsck to see if there is something amiss on the harddrive.
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Hi friends,
I have an External Hardisk where SAP is installed in it i.e., Win 2003 on C drive & SAP on D drive.
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Hi,
You can not boot OS from USB devices in Windows.
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When booting up I cannot get past the light blue logo with spinning disc. I have tried it with the install disc and using different keystrokes, i.e. "shift, s, c, o, " please advise. thank you in advance.

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My MacBook Pro has 10.5.8 but came with 10.5.7 install disc and won't boot up and can't reinstall

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Welcome to the Apple community.
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See this article.

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How to boot from install disc and do a clean install

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