Heb je ooit zelf het geheugen vervangen?
Toen ik het moederbord had log gemaakt en de koelplaat eraf geschroefd toen heb ik ook het plastic beschermdeel dat rondom het geheugen zit verwijderd, dit deed ik om beter te zien wat er mis was met de processor.
Tja, ik begin hier ook te vrezen dat mogelijk de geheugenslots beschadigd zijn:
Heb je het geheugen goed aangedrukt totdat het een soort klikje gaf?
meteen hierna herstart hij weer met zwart beeld en zonder geluid
LED FunctionsLED #1Indicates that the trickle voltage from power supply has been detected by main logic board.This LED will turn ON when you connect the iMac to a working AC power source. The LED willremain ON as long as the computer is ON or asleep.When computer has been correctly shut down, the LED#1 behavior may differ:• - If a startup event is scheduled in System Preferences > Energy Saver, LED#1 will stay ONafter a correct shutdown,• - If no startup event is scheduled in System Preferences > Energy Saver, LED#1 will turnOFF and will stay OFF as long as power cord is connected and AC power source is present.Disconnecting the power cord and plugging it back will turn back this LED ON , even ifcomputer is still off.• After disconnecting and reconnecting the AC power source, this LED could remain OFF ifthe AC power source is missing or disconnected, if the logic board is disconnected from thepower supply or from the AC outlet, or if the power supply board is faulty.LED #2Indicates that computer is turned on. This LED will be ON as long as computer is turned on (butis not asleep) and power supply and voltage regulators are working correctly.LED #3Indicates that computer and video card are communicating. This LED will be ON whencomputer is communicating properly with video card. If LEDs 1 and 2 are ON and you heard thestartup sound, but LED 3 is OFF, then the backup battery (on front of logic board) may need tobe reseated, or the video card might be installed incorrectly or needs replacement.2011-05-24 iMac (21.5-inch, Mid 2011) General Troubleshooting 27LED #4Indicates that computer and LCD panel are communicating. This LED will be ON whencomputer is turned on and video signal is being generated. If LED #4 is ON and there is noimage on display, then LCD panel, LED backlight board, or cables between LCD and logic boardor backlight board might be installed incorrectly, or need replacement.
Ik help je duimen, hoor! Je pakt het wel drastisch aan. Succes!