New hard drive in 27" iMac doesn't recognise login password?

Just had new 2 terabyte hard drive installed in 27" iMac operating with Lion. Most files migrated from old damaged hard drive but not applications. on start up my existing log in password is not accepted. Any ideas how I can log in? Tried logging into utilities on start up and repair permissions but did not help.

Who installed the hard drive and if Lion was installed on the new drive, how/where did that download come from and whose Apple ID was used to download it?

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near zero.
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I have just installed a new hard drive in my imac intel 20" (2006) and now the hard drive does not show up in the 'select destinations' folder of the install program.

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Anyone?

Thats correct. I can see it in the list however when I attempt to erase it or partition it it's like it's not being found or recognised and it throws up the input/output error message. I am pretty sure that the sensor it attached correctly and it is a SATA drive. I can see all the infor regarding the drive when disk utility is open and it all looks good but I cant access it or do anything with it. It's taunting me!
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when you partition and format the new bare drive are you running off of an install disc in the optical drive? I have used the install disk for Leopard to access the Disc Utility (did not install Leapard, just used it to access the Disc Utility) as well as the machine prompting me to take action due to the new hard drive being recognized, again using disc utility and using the install disc provided by the hard drive manufacturer. All of these were done according to instruction as previously mentioned, on a reformatted and partitioned drive each time.
What OS version are you nstalling on the bare drive before you attempt to restore from your Time Machine backup? I have not installed any OS on the bare drive. I do not have a copy of Lion 10.7.5 as I purchased it through the app store. I was under the impression I could reinstall all the data through Time Machine but that is proving elusive - frustrating.
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Serial Number QP*****1LW
<Edited by Host>

Here are some notes on Time Machine problems.
http://pondini.org/TM/
Troubleshooting.html
I have asked the hosts that your serial number be removed. Best not to publish it,

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The iMac's hard drive is rather difficult to get to. You can replace it but will have to get through the front panel, which is not a simple task. Additionally, on at least some systems (I believe the iMac is one of them) Apple uses a special hard drive firmware, without which the system fans will blare at full blast.
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Hi db2
That off the shelf MS-DOS / FAT-32 drive needs to re-partitioned GUID Partition Table / Mac OS Extended (Journaled) before you can install OS X and Startup your Intel iMac from it.
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3. Under Volume Scheme select 1 Partition and click on the Options... button.
4. Select GUID Partition Table in the drop down window and click OK.
5. Set the Format to Mac OS Extended (Journaled) and click the Apply button.
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Dennis

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Thanks den.thed,
Apologies for not replying back sooner - I've been away.
Although your suggestion helped me in getting a copy of Lion that I could use, it didn't help with the restore from Time Capsule issue. I had to download the Lion app onto my MacBook & then transfer it across but it wouldn't let me upgrade my OS for some reason, so I ended up wiping the iMac completely and restoring via my Snow Leopard install disk. For some reason, this time, it let me have the option of using Setup Assistant to access the Time Capsule for a complete restore.
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New hard drive in 27" iMac doesn't recognise login password?

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