21.5” late iMac 2009 model 1311 Black Death screen fix

[Kentertainments75]

I have 21.5” iMac late 2009 model 1311. When I bought it it was with incomplete os installed till disk utility.

1 Internal display Was work

2 external display was work

3 usb bootable

but facing 3 problems

1 dead pram battery

2 late start button response

3 Mac hdd show multiple error message while OS X installation.

after replacing same model number pram battery.

1 Display stop working. Internal & external.

2 usb bootable stop working.

3 I replaced new display lcd cable, pram battery & vertice synchronised cable.

4 mac hdd showing multiple errors that is why I make partition through trans MAC software through windows.

5 tried new hdd also

6 try prm reset, safe mode, options to boot, bootable, external display, another Mac OS clone via usb hdd, f1 f2 brightness, heat sink for processor & graphic card, almost everything.

current stage

1 Imac work

2 start sound & chimp sound work

3 fan work

3 led diagnostic light work

4 No display

please help

read almost more than 50 articles & 40 YouTube videos

 

[Cory Cooper]

Hello and welcome.

Normally, an iMac is not a user-serviceable computer, as it is quite involved to repair. Other internal components can easily be damaged without the proper experience and procedures.

That said, I would have only replaced the battery and HDD and possibly the HDD cable. The power button delay can be somewhat normal. It sounds like either some of the replacement parts are defective, not seated properly, or other damage has occurred during the repair(s).

Not much to suggest, as it is nearly impossible to diagnose remotely, without being able to have hands-on the iMac.

Sorry,

C