iMac 27" , 4-5 years old , "dead"

[grimpus]

Hi

Any ideas ?

It starts with stripes on the screen , goes into the "movin bar" but doesnt finish and after that just white screen .
Can hear harddisk access .

Thanks for any hints or things I can try

 

[thedeske]

Hi

Any ideas ?

It starts with stripes on the screen , goes into the "movin bar" but doesnt finish and after that just white screen .
Can hear harddisk access .

Thanks for any hints or things I can try

GPU Down?

 

[fastlanephil]

Hi

Any ideas ?

It starts with stripes on the screen , goes into the "movin bar" but doesnt finish and after that just white screen .
Can hear harddisk access .

Thanks for any hints or things I can try

Is that 2011 27" iMac with the 3.1 quad core i5 processor or the 3.4 quad core i7 processor?

If so then there is a known problem with the graphics board on these models that Apple addressed during a repair program that ended a few years ago.

 

[grimpus]

The GPU does display the moving bar before it stops and apple symbol - can it be partly damaged ?

The iMac was part of the periode with the HD replacement ( http://9to5mac.com/2012/10/19/apple...-to-imac-owners-with-1tb-seagate-hard-drives/ ) , so earlier than 2011 .

Is it possible to do a factory reset in this condition ?
Will I be able to keep files on harddisk if possible ?

 

[fastlanephil]

Maybe it's a hard drive problem. Have you tried booting from an external drive. This will tell you if it's the hard drive or something to do with the board.

I back up my system drive using Carbon Copy Cloner on an external drive so I always have a way to boot up if the drive is starting to go bad.

Have you tried an OS recovery install. You restart and quickly hold down the command and R keys until the recovery option comes up on the screen if it can in your case.

You also could have a bad stick of memory. If you upgraded your memory and still have the old DIMMs try swapping them out.

 

[grimpus]

Problem found and repaired

It was the graphic chip ..they say it can last for a while , but not forever ..

Keeping my fingers crossed ..

Thanks for yr helpfull inputs !

 

[N2bnfunn]

More then likely it is the "Power Supply".

 

[mmomega]

So did anyone ever figure out what model iMac this is? Size?