I have vertices lines on start up.
My 6yr old 27 inch iMac has got vertical lines on start up ,which after a while goes white,
Do you know what could be the cause?
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This machine?
The problems have been documented over the past couple of years on Apple’s own Support Forums. Above is a YouTube video demonstrating some of the noted issues. Additionally, the iMacs must fall in the following serial number configurations:
The last four characters of the serial number must contain one of the following groups (for example, xxxxxxxxDHJQ):
DHJQ, DHJW, DL8Q, DNGH, DNJ9, or DMW8
DPM1, DPM2, DPNV, DNY0, DRVP, DY6F, F610
iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program
Apple has determined that some AMD Radeon HD 6970M video cards used in 27-inch iMac computers with 3.1GHz quad-core Intel Core i5 or 3.4GHz quad-core Intel Core i7 processors may fail, causing the computer’s display to appear distorted, white or blue with vertical lines, or to turn black. iMac computers with affected video cards were sold between May 2011 and October 2012.
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