Logic Board was replaced - Now Time Machine does not show previous backups

Hi
Bit desperate here.
My Apple store changed my hard disk and the logic board along with it.
I'm now aware that this means my MAC address has changed - which is what your Time Machine looks for when it tries to back up.
So now the backups are failing, and I KNOW there's a HINT offered on macosxhints.com
http://www.macosxhints.com/article.php?story=20080128003716101&query=Time%2Bmach ine%2Blogic
- but I have absolutely NO previous experience with TERMINAL and minute I try to re direct terminal to my Time Machine Volume : it tells me there is no such file or directory. It's all gobbledygook to me. I think the person that wrote it ASSUMED some previous knowledge of using terminal.
The things I DO know are: My MAC address number, and my TM Volume is called The BIG BACKUP (not Time Machine). It doesn't
Can anyone make this clearer for me, or indeed is there an easier way.
I know I could just tell TM to change disk and just star afresh - but I'm under the impression that it's very uneccessary for me to lose all my previous backups.
Hey, many, many thanks if you can help
Simon

Hello K.V.
(I'm having to come back to this when I get a minute at the moment)
Many thanks for your suggestions so far. Several things have occured:
Firstly I did what you instructed in your last post, that seem to let me go on without any further errors - so I then when back to my desktop - dismounted The BIG BACKUP and restarted the whole mac, remounting the The BIG BACKUP. I went to the 'Back Up Now' commend to test it and it failed, sayind it could not find the file or directory.
So this evening I started in terminal from scratch - when I got to the ls -al command I noticed that my old address was no longer in the list, it was on the line before the new address before (I also punched in the wrong mac address intially but spotted it and rectified my mistake .001f5beb34e5 being the correct one) as you can see from below it now says my old address is No such file or directory.
Here is a copy of what happened
Last login: Mon Jul 21 19:27:07 on ttys000
simon-evanss-imac:~ simonevans$ cd /Volumes/"The BIG BACKUP"/Backups.backupdb
simon-evanss-imac:Backups.backupdb simonevans$ xattr -p com.apple.backupd.BackupMachineAddress "simon-evanss-imac"
No such file: simon-evanss-imac
simon-evanss-imac:Backups.backupdb simonevans$ xattr -p com.apple.backupd.BackupMachineAddress"simon-evanss-imac"
simon-evanss-imac:Backups.backupdb simonevans$ cd ..
simon-evanss-imac:The BIG BACKUP simonevans$ ls -al
total 104
drwxr-xr-x@ 16 simonevans staff 612 20 Jul 22:44 .
drwxrwxrwt@ 6 root admin 204 21 Jul 21:13 ..
-r-------- 1 simonevans staff 16 24 Apr 23:56 .001f5beb34e5
-rw-r--r--@ 1 simonevans staff 6148 21 Jul 19:08 .DS_Store
drwx------ 3 simonevans staff 102 24 Apr 23:55 .Spotlight-V100
d-wx-wx-wt 3 simonevans staff 102 19 Jul 09:25 .Trashes
-rw-r--r-- 1 root staff 0 25 Apr 09:23 .com.apple.timemachine.supported
drwx------ 8 simonevans staff 272 21 Jul 19:32 .fseventsd
drwxr-xr-x@ 3 root staff 102 20 Jul 22:56 Backups.backupdb
-rw-r--r--@ 1 simonevans staff 1024 1 Jan 1970 Desktop DB
-rw-r--r--@ 1 simonevans staff 2 1 Jan 1970 Desktop DF
-rw-r--r--@ 1 simonevans staff 0 1 Jan 1970 Icon?
drwxr-xr-x 5 simonevans staff 170 24 Apr 23:55 MANUALS
drwxr-xr-x 5 simonevans staff 170 24 Apr 23:55 SOFTWARE
simon-evanss-imac:The BIG BACKUP simonevans$ sudo fsaclctl -p /Volumes/"The BIG BACKUP"
Password:
Access control lists are supported on /Volumes/The BIG BACKUP.
simon-evanss-imac:The BIG BACKUP simonevans$ sudo mv .001b639a9935 .001f5beb34e5mv: .001b639a9935: No such file or directory
simon-evanss-imac:The BIG BACKUP simonevans$ sudo mv .001b639a9935 .001cb37264bc
Password:
mv: rename .001b639a9935 to .001cb37264bc: No such file or directory
simon-evanss-imac:The BIG BACKUP simonevans$ sudo mv .001b639a9935 .001f5beb34e5
Password:
mv: .001b639a9935: No such file or directory
simon-evanss-imac:The BIG BACKUP simonevans$
Very confusing huh.
To be honest now, I guess my prime concern is if I've made any damaging changes to things I don't understand or not - and I think it may be best if I accept the Time Machine starting afresh from square one by clearing the external drive and re-directing TM to it. I could live with this I guess, so long as it worked.
What do you think?
Many thanks
Simon

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    Hi Pondini,
    I got it fixed today, thank you everyone for your help. The thing that ended up fixing it was deleting the hidden files ".com.apple.timemachine.supported" and ".002332b4a7fc" on the root directory of the time machine disk. Now my months worth of backups are viewable again!
    I didn't find this on your website (maybe I didn't look hard enough). If it's not there, perhaps it would be a good thing to add to your site? Hopefully it will save a few people some frustration! Thanks for making the site - it looks like a great resource.
    --Hayden

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