Logic Board Replaced - Time Machine doesn't recognize old backup!

pprior · Dec 31, 2008, 11:51 AM

Had to have the logic board in my Mac Pro replaced due to faulty audio input jack.

Time machine backs up to an external drive (DROBO array).

When I brought the machine back home, time machine does not recognize the old backup (last backup never) and doesn't have room to backup a new system because the old TM files take up most of the drivespace.

Is there a way to "force" time machine to accept an old TM backup file? I don't want to delete everything and start again. I assume this is because the logic board (motherboard) was replaced.

Note that the system drive and all internal hard drives were not modified, and the OS was not reinstalled or anything like that.

One other item: the tech forgot to run some software at apple and my machine currently has no serial number (about this mac...) assigned. They are sending out a tech to fix this - does time machine back up based on serial number? If so, maybe that will fix the problem.

thanks for any help!

Amdahl · 02:49 PM

Time Machine uses the Ethernet adapter MAC/serial address as an ID. If you have a new logic board, you have a new MAC address.

This link describes what to do:
http://www.macosxhints.com/article.p...80128003716101

Be sure to note the correction in comment "Minor correction (escape the spaces)", or you might have trouble.

Looks like this one also might be key: "By: tnmacguy on Fri, Apr 4 2008 at 8:35PM PDT."

Basically, it sounds like a pretty tricky situation.

pprior · Dec 31, 2008, 04:47 PM

Wow, thanks SO much that sounds like exactly what I need. I'll try and run through this later when I have a bit of time and will report back if I'm successful.

Again I really appreciate this help - I never could have possibly figured that out by myself!

pprior · Jan 4, 2009, 12:53 PM

Too many problems posted with inability to go back to old backups.

I ended up reformatting and starting from scratch with my backup disk.

Apple really should make this work better.

thanks again anyway, I do appreciate the effort!

Dec 31, 2008, 11:51 AM	#1
pprior macrumors 65816 Join Date: Aug 2007	Logic Board Replaced - Time Machine doesn't recognize old backup! Had to have the logic board in my Mac Pro replaced due to faulty audio input jack. Time machine backs up to an external drive (DROBO array). When I brought the machine back home, time machine does not recognize the old backup (last backup never) and doesn't have room to backup a new system because the old TM files take up most of the drivespace. Is there a way to "force" time machine to accept an old TM backup file? I don't want to delete everything and start again. I assume this is because the logic board (motherboard) was replaced. Note that the system drive and all internal hard drives were not modified, and the OS was not reinstalled or anything like that. One other item: the tech forgot to run some software at apple and my machine currently has no serial number (about this mac...) assigned. They are sending out a tech to fix this - does time machine back up based on serial number? If so, maybe that will fix the problem. thanks for any help!
	0

Dec 31, 2008, 02:38 PM	#2
Amdahl macrumors 65816 Join Date: Jul 2004	Time Machine uses the Ethernet adapter MAC/serial address as an ID. If you have a new logic board, you have a new MAC address. This link describes what to do: http://www.macosxhints.com/article.p...80128003716101 Be sure to note the correction in comment "Minor correction (escape the spaces)", or you might have trouble. Looks like this one also might be key: "By: tnmacguy on Fri, Apr 4 2008 at 8:35PM PDT." Basically, it sounds like a pretty tricky situation. Last edited by Amdahl; Dec 31, 2008 at 02:49 PM. Reason: add notes on comments
	0

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
thread	Thread Starter	Forum	Replies	Last Post
Time Machine Won't Recognize Old Backup	flyer05	Mac OS X 10.7 Lion	3	Sep 4, 2011 07:31 PM
Time Machine doesn't have enough room to backup?	chocolate632	Mac Applications and Mac App Store	2	May 21, 2011 05:35 PM
Time Machine doesn't recognize old backup after logic board replacement	washer	Mac Basics and Help	3	Sep 3, 2009 07:09 AM
Recently got a repaired MBP back, Time Machine won't recognize old backup	peppermints	Mac OS X	3	Jun 24, 2009 08:44 PM
Time Machine not recognizing old backups	Ryan5191	Mac OS X	0	Apr 22, 2009 03:36 PM

Dec 31, 2008, 04:47 PM	#3
pprior Thread Starter macrumors 65816 Join Date: Aug 2007	Wow, thanks SO much that sounds like exactly what I need. I'll try and run through this later when I have a bit of time and will report back if I'm successful. Again I really appreciate this help - I never could have possibly figured that out by myself!
	0

Jan 4, 2009, 12:53 PM	#4
pprior Thread Starter macrumors 65816 Join Date: Aug 2007	Too many problems posted with inability to go back to old backups. I ended up reformatting and starting from scratch with my backup disk. Apple really should make this work better. thanks again anyway, I do appreciate the effort!
	0