Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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LCD temperature boot problem

From one day to another computer monitor has stopped working properly. CHIME is heard but not seen the white snapshot start. Also does not connect the keyboard (even USB) so I can not start the session.

Can the graphics card cause such a problem (not able to connect to mouse and keyboard)? Does the display cause this?

I dont want to buy another display and find out that It wasnt the problem.

Is there any way to start a session without keyboard or mouse. I need to check if I can use a external screen, to see if the computer still work properly beside the disply matter.

Any ideas???

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See if 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

If so go here for a free fix: http://9to5mac.com/2013/08/16/apple-open...

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Bad luck. Its DHJP.

The thing is that everywhere I look for the same problem, I found that all the people can at least conect their mouse and keyboards, while my IMac doent seem to reconige them. Not even USB keyboard.

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