Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

261 Questions View all

iMac shows a distorted blank/rainbow pixel screen after turning it on

iMac works when I press the shift key during start up, which then opens in Safe mode, but during a normal startup, after the apple logo disappears and leads to the login page, instead of the log-in page, a half blank white screen, with rainbow pixels distort half of the blank screen. The iMac works as expected during safe mode as the login page appears, seems normal as well as the desktop after login.

Answered! View the answer I have this problem too

Is this a good question?

Score 0

Comments:

Can you give us your exact model so we can guide you to the correct guide and needed part.

Look at the bottom of your systems foot stand to find the serial number and plug it into here: EveryMac - Lookup then paste your systems URL here for us to see.

by

Add a comment
Deck the Halls
With tools and Fix Kits

2 Answers

Chosen Solution

Does the last four characters of the serial number contain one of the following groups (for example, xxxxxxxxDHJQ):

DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8

DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610

The serial number can be found on the bottom of the stand or under "about this Mac".

Was this answer helpful?

Score 1
Add a comment
Most Helpful Answer

Sadly, your GPU boards VRAM has problems.

When you go into Safe Mode you are using the low resolution mode of the GPU which uses shared RAM. When you normally startup the system starts off in low res then switches into normal mode leveraging the GPU's VRAM.

Was this answer helpful?

Score 3

Comments:

Is this type of issue able to be fixed?

by

Can you give us your model info as it depends on what you have.

by

Hi Dan, it is a 27 inch LED-LCD iMac (Aluminum Unibody) bought in 2010 (this model was released in 2009 and discontinued in 2012)

by

@samneedshelp - Sam that still covers over 30 different models.

We're guessing here you have the Mid 2010 model. To be sure click on the blue link I posted under you question and plug in your systems S/N.

by

Add a comment

Add your answer

Sam will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 6

All Time: 69