New To Mac-Forums?

Welcome to our community! Join the discussion today by registering your FREE account. If you have any problems with the registration process, please contact us!

Get your questions answered by community gurus Advice and insight from world-class Apple enthusiasts Exclusive access to members-only contests, giveaways and deals

Join today!

Start a Discussion

Mac-Forums Brief

Subscribe to Mac-Forums Brief to receive special offers from Mac-Forums partners and sponsors

Join the conversation RSS
Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

late 2009 iMac partially black screen graphics help

Post Reply New Thread Subscribe

Thread Tools

Member Since: Mar 24, 2011
Posts: 6
denyason is on a distinguished road

denyason is offline
I have a late 2009 27 inch imac which started to get this issue:- webpages will have black where images should be, open window boxes will be black, drop down menu's either black or multicoloured and can't be read, mouse over icons on dock makes them black, text documents is all black- however the wallpaper is normal and borders of the webpages etc...
Booted using the apple hardware test cd- short test and long result resulted in no hardware issues however only long test fixes the black issue for a day before it returns again.
What is the issue, do i need to replace the graphics card. I believe there is alot of dust inside so could this be the issue? I also installed the smc fancontroll and set speeds of around 2000rpm with average temps under 55'c. Before smc speeds were default to 1000 rpm and temp highest was 60'c.
I have also tried switch on imac when fully cold, but straight away the issue is present even though temp is low of 30'c. so far the only fix is to long test using the apple hardware test cd.
Please give informed help as i am pretty useless with regards to programs etc..having been a pc user before this imac.
incidently the graphics card is ati Radeon HD 4850 512 MB.
QUOTE Thanks

chscag's Avatar
Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 44,818
chscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond reputechscag has a reputation beyond repute
Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

chscag is online now
The best way to test the graphics chipset on your iMac is to attach an external monitor or TV to it. You'll need the proper adapter and cable in order to do so, but that will tell you if it's a graphics problem or related to something else. If the external monitor displays the same problem, then you'll know it's graphics related.

About the graphics card in your iMac... I'm not sure if it can be replaced without replacing the entire logic board. Some older models of iMac had a removable graphics card, others did not. You may be able to find out by going to iFixit: The free repair manual - iFixit and look up the repair procedures for your model iMac.
QUOTE Thanks

Post Reply New Thread Subscribe

« 21.5 ips monitors | Unlinking Adobe Reader from Safari »
Thread Tools

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Posting 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 Off
Forum Jump

Similar Threads
Thread Starter
Last Post
Replace 17" iMac Screen freshstylerdj Apple Desktops 2 04-29-2014 03:27 PM
worth saving late-model 2009 iMac? kenalex Apple Desktops 12 04-23-2014 08:54 AM
New iMac 27" late 2013 help and questions! athinamj Apple Desktops 7 04-16-2014 02:20 PM
New M/B pro, black screen, no start up srspicer Apple Notebooks 3 03-26-2014 07:16 PM
no screen display, stays black Clairep OS X - Operating System 2 03-18-2014 01:45 PM

All times are GMT -4. The time now is 03:44 PM.

Powered by vBulletin
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.

Welcome to

Create your username to jump into the discussion!

New members like you have made this community the ultimate source for your Mac since 2003!

(4 digit year)

Already a member?