• Video: iMac 2011 Grafikkarte reparieren
• https://de.ifixit.com/Store/Mac/iMac-27-Inch-Mid-2011-Graphics-Card/IF174-054-2
• https://www.youtube.com/watch?v=PaRtza6h9mQ
• https://www.macuser.de/threads/imac-27-2011-ati-radeon-hd-6970m-2gb-defekt.795888/page-1
• https://www.macuser.de/threads/bootprobleme-mit-display-problemen-17er.797714/
• https://agile-websites.de/artikel/der-mac-ist-tot-der-mac-ist-tot.html

Fix für Macbook Pro 2011 (internal Graphics), funktioniert nicht auf dem iMac 2011:

• https://apple.stackexchange.com/questions/267581/gpu-problem-boot-hangs-on-grey-screen/295805#295805

andere MXM-Grafikkarte im iMac (Geforce GTX 765m)

• https://www.ebay.com/itm/9R3F5-DELL-ALIENWARE-M17X-M18X-NVIDIA-GTX-765M-2GB-GRAPHIC-CARD-VIDEO-CARD/162776542264
• https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-28#post-24436097
• https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-30
• https://www.macuser.de/threads/imac-mid-2011-27-grafikkarten-upgrade.827855/page-2

• https://de.ifixit.com/Anleitung/iMac+Intel+27-Inch+EMC+2429+Display+Austausch/7551
• https://de.ifixit.com/Anleitung/iMac+Intel+27-Inch+EMC+2309+or+2374+Grafikkarte+Austausch/9553

• https://www.die-oswalds.de/blog/2019/10/06/der-2011er-imac-und-das-leidige-thema-mit-der-grafikkarte/
• https://www.die-oswalds.de/blog/2019/12/20/der-2011er-imac-und-das-leidige-thema-mit-der-grafikkarte-teil-2/

VBIOS ändern (?)

• https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-90?post=27485731#post-27485731
• https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-152?post=28046843#post-28046843
• https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/page-144?post=28011314#post-28011314
• https://hardforum.com/threads/nvidia-firmware-flashing-utility-for-linux.1838661/
• https://www.reddit.com/r/linuxquestions/comments/74d3bx/update_gpu_bios/
• https://computeco.de/DyingLight.html
• https://de.ifixit.com/Antworten/Ansehen/296157/What+GPU's+are+compatible+with+iMac+27%22+2011#answer420333

• http://www.smartmod.de/shop/smartphone-iphone-ipad-kaufen/gebrauchte-macs-kaufen.html
• http://apfelstudio.net/amd-grafikkarten-bug-apple-macbook-imac-2011
• https://www.apfelwerk.de/apple-werkstatt/
• technikfreund
• TMC TEC Berlin
• Witcomp
• http://dtec24.de

Sofort nach dem Neustart des Systems die Taste D drücken:

Fehlercodes:

• 4ETH: Ethernet controller
• 4IRP: Main Logic board
• 4MLB: Logic board controller
• 4PRC: Processor
• 4HDD: Hard disk
• 4MHD: External disk
• 4YDC: Video card
• 4SNS: System sensor
• 4MOT: Fan motor
• 4MEM: Memory module
• 4AIR: AirPort wireless card

Bei Sensor-Fehler: „I“ -Strom, „T“ -Temperatur, oder „V“ -Spannung

• A: Ambient air sensor
• B: Battery
• C: Central processors (CPU)
• D: DC (direct current)
• e: PCI-express slot
• F: FireWire port
• G: Graphics processor (GPU)
• H: Hard disk
• h: Heat pipe (heat sink)
• L: LCD display
• M: Memory or memory riser boards
• m: Misc. (i.e., battery chargers)
• N: North bridge (motherboard controller)
• O: Optical drives
• P: Power bus
• p: Power supply
• s: Palm rests for laptops
• W: Airport Wi-Fi card

4SNS/1/1/4000000 TL0P-130: Sensorfehler im LCD Temperatur Sensor eines Laptops