Welcome to the MacNN Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > 2007 iMac 20

2007 iMac 20
Thread Tools
RedRiverD
Fresh-Faced Recruit
Join Date: Oct 2009
Location: Ava, MO
Status: Offline
Reply With Quote
Oct 5, 2009, 04:09 PM
 
I have a 2007 iMac 20 and recently the screen has started flashing from dim to bright.
I can reboot and it runs fine for awhile then it starts again.
For the past couple of days I have had no incidences of this type.
While I was in town a week ago I went to a Mac store and they implied that the video card was going out.
ATI Radeon HD 2400XT.
I have done some research and discovered that a new card (identical type) would be about $250!
Can you upgrade video cards in iMacs (with say an ATI Radeon HD 2600XT) or do you have to replace it with an exact part?
I have built PC's for years, but this is my first Mac. I have already upgraded the memory with no problems,
but I have never "cracked" the case and don't really see a problem.
Can anyone advise?
     
P
Moderator
Join Date: Apr 2000
Location: Gothenburg, Sweden
Status: Offline
Reply With Quote
Oct 5, 2009, 04:22 PM
 
I don't think it's the video card, I think it's the backlight which has a bad connection to the power - possibly only when overheating. Is the iMac warm to the touch? Tried cleaning out the fan grilles?
The low-end Mac Pro is the most overpriced Mac since the IIvx
     
   
Thread Tools
Forum Links
Forum Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On
Top
Privacy Policy
All times are GMT -5. The time now is 11:39 PM.
All contents of these forums © 1995-2011 MacNN. All rights reserved.
Branding + Design: www.gesamtbild.com
vBulletin v.3.8.7 © 2000-2011, Jelsoft Enterprises Ltd., Content Relevant URLs by vBSEO 3.3.2