Results 1 to 7 of 7
  1. #1


    Member Since
    Jan 18, 2010
    Posts
    3
    iMac RAM downgrade - iMac won't start
    Hi ...

    ... two imac 27" computers ... first with 2x2GRAM ... second with 2x1GRAM ... I have switch the RAM plates from one computer to another ... so I upgraded one from 2 to 4GRAM ... and I downgraded other one from 4 to 2GRAM ...

    ... the upgraded one works perfect ...
    ... the downgraded one wont even start ... ???


    ... please help

    thank you

  2. #2

    Reel1's Avatar
    Member Since
    Nov 29, 2006
    Location
    Barrie, Ontario, Canada
    Posts
    606
    Specs:
    2.16 GHz Intel Imac Core 2 Duo//MacBook 1.83 Core 2 Duo//G5 Power Mac
    different type of ram possibly

  3. #3


    Member Since
    Jan 18, 2010
    Posts
    3
    but this type was on the upgraded one before ... and it all works well ...

  4. #4

    Reel1's Avatar
    Member Since
    Nov 29, 2006
    Location
    Barrie, Ontario, Canada
    Posts
    606
    Specs:
    2.16 GHz Intel Imac Core 2 Duo//MacBook 1.83 Core 2 Duo//G5 Power Mac
    maybe you have not seated it correctly or all the way

  5. #5


    Member Since
    Jan 18, 2010
    Posts
    3
    I think it could be a problem in Mhz of RAM ... because one Imac is older than other ... we will see ...

  6. #6

    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
    Location
    MA
    Posts
    8,806
    Specs:
    27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 6S, iPod Nano 7th GeniPad 3
    Does the upgraded iMac properly and fully report the 4GB of new memory? Usually RAM sticks need to be installed in matched pairs. So the downgraded iMac is most likely complaining about that..

    Regards

  7. #7


    Member Since
    Jan 07, 2010
    Posts
    24
    Quote Originally Posted by Raz0rEdge View Post
    Does the upgraded iMac properly and fully report the 4GB of new memory? Usually RAM sticks need to be installed in matched pairs. So the downgraded iMac is most likely complaining about that.. Regards
    I agree with this as well. Being a certified Tech, we were told to NEVER mix memory simm brands and NEVER mix memory speeds either. Always keep the same (or nearest) speed as the factory memory simms. Keep them all the same - to avoid current and possible future problems. If wondering, I have mixed memory simms on my own machines. But, never done it on my customer's workstations.

    Hope this helps as well...

    .

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Help - my imac won't start
    By oberstivan in forum Apple Desktops
    Replies: 1
    Last Post: 10-04-2013, 07:28 PM
  2. iMac won't start
    By nmatthews in forum Switcher Hangout
    Replies: 3
    Last Post: 09-13-2012, 08:33 AM
  3. Imac - Won't Start - HELP :(
    By eccleshall91 in forum Apple Desktops
    Replies: 6
    Last Post: 03-11-2010, 09:48 AM
  4. G5 iMac won't start up
    By jimwardlaw in forum Apple Desktops
    Replies: 1
    Last Post: 12-27-2006, 09:28 PM
  5. IMAC won't start up !
    By pkcousins in forum Apple Desktops
    Replies: 4
    Last Post: 07-31-2004, 12:26 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •